What causes precession and other orbital changes | Cosmology & Astronomy | Khan Academy
A1 A2 B1 B2 C1 C2
right
US / raɪt /
•UK / raɪt /
- adjecitve
- Correct or true
- The south side of you looking at the rising sun
- adverb
- Exactly in a place or time
- Being appropriate for a particular event
- In a straight or direct manner
- noun
- Something you are legally or morally allowed to do
- Ideal of what is just and good
- Political view based on conservatism
- verb
- To fix something previously wrong or unjust
- To make upright, as a boat that has turned over
tell
US / tel /
•UK / tɛl /
- verb
- To (strongly) advise a person to do something
- To be able to guess
- To say or communicate information to someone
- To inform, but without speaking; indicate
- To have a negative effect on someone
- To order someone to do something; command
- To recognize something based on certain signs
- To report something to an authority
- To explain something or teach someone something
type
US / taɪp /
•UK / taɪp /
- noun
- Printed letters or blocks used for printing them
- Group of things or people sharing common features
- verb
- To identify something belonging to a group
- To write by touching keys on a keyboard
about
US / ə'baʊt /
•UK / əˈbaʊt /
- adverb
- To be ready to; going to
- Nearly; approximately; roughly
- Near; next to; close to
- In every direction; in the area of
- preposition
- Concerning or of (a topic)
again
US / ə'ɡen /
•UK / əˈɡɛn /
- adverb
- One more time, once more
that
US / ðæt /
•UK / ðæt, ðət /
- adjecitve
- The person or thing being talked about
- Used to identify something both the speakers know
- adverb
- Used to reinforce adjectives and adverbs
- To such a degree
- conjunction
- Used to connect a noun clause
- Used to introduce an adverbial clause
- Used to introduce a noun clause
- determiner
- Used as a noun to refer to something
- pronoun
- Referring an object far away
- Used to refer to the relative pronoun ‘which’
cause
US / kɔ:z /
•UK / kɔz /
- noun
- Belief, goal or organization that people support
- Reason for
- verb
- To make something happen; create effect or result
happen
US / 'hæpən /
•UK / ˈhæpən /
- verb
- To take place or occur
ellipse
US / ɪˈlɪps /
•UK / ɪˈlɪps /
- noun
- Plane curve made by cone and plane intersecting
change
US / tʃeɪndʒ /
•UK / tʃendʒ /
- noun
- Exchange of one set of clothes for another
- Money in the form of coins instead of paper
- Money returned after giving too much
- Act of making or becoming something else
- verb
- To exchange one set of clothes for another
- To exchange one kind of money for another
- To replace something with another thing
- To make or become something else
- To go from one train, bus, etc. and go to another
solar
US / 'səʊlə(r) /
•UK / ˈsolɚ /
- adjecitve
- Concerning the sun, or its heat
bit
US / bɪt /
•UK / bɪt /
- noun
- Device put in a horse's mouth to control it
- Small piece of something
- verb
- (E.g. of fish) to take bait and be caught
kilometre
US / ˈkɪləmi:tə(r) /
•UK / ˈkɪləmiːtər /
- noun
- A metric unit of length equal to 1000 metres
moon
US / mu:n /
•UK / mun /
- noun
- Round object circling the Earth at night
- verb
- To expose your buttocks as a joke
between
US / bɪˈtwi:n /
•UK / bɪˈtwin /
- preposition
- From one person, thing, or place, to another
- In the space that separates two objects
- Among two or more people who share something
they
US / ðeɪ /
•UK / ðe /
- pronoun
- Two or more people, animals, or things
due
US / dju: /
•UK / du, dju /
- adjecitve
- When something is required or expected
- Owed to a person as a right
- noun
- Something you deserve; something you can expect
fat
US / fæt /
•UK / fæt /
- adjecitve
- Having too much weight for the body size
- Bringing or having a large amount of money
- noun
- Amount beyond what is usual or necessary
- Oily part of meat
all
US / ɔ:l /
•UK / ɔl /
- adverb
- Completely; totally
- determiner
- Being every one of something
- pronoun
- 100% of something; the complete amount
its
US / ɪts /
•UK / ɪts /
- adjecitve
- Referring to or belonging to ‘it’
- determiner
- Of something; belonging or related to something
- other
- Possessive form of “it”
bulge
US / bʌldʒ /
•UK / bʌldʒ /
- noun
- Rounded full or fat lump on the surface of a thing
- Rapid increase in size
- verb
- To curve outward from the surface, as when full
into
US / 'ɪntə /
•UK / ˈɪntu /
- preposition
- Moving or going inside something
- In the same direction as; in the direction of
- So as to become; taking the state of
other
US / 'ʌðə(r) /
•UK / ˈʌðər /
- adjecitve
- A thing different from that mentioned
- determiner
- (Something) else; not the first (one)
- pronoun
- Being the one and only thing of that category
noticeable
US / ˈnəʊtɪsəbl /
•UK / ˈnoʊtɪsəbl /
- adjecitve
- Being easy or likely to be sensed or noticed
perfect
US / 'pɜ:fɪkt /
•UK / ˈpɚfɪkt /
- adjecitve
- So good it cannot be improved
- verb
- To do something so well, it cannot be done better
pull
US / pʊl /
•UK / pʊl /
- noun
- Act of breathing in smoke, as from a pipe
- Force something has that draws other things to it
- Using your hands to move something to you
- verb
- To breathe in smoke, as from a pipe
- To hold something and move it toward you
- To remove something by force
one
US / wʌn /
•UK / wʌn /
- pronoun
- You; we; people in general; someone
- The thing or person previously referred to
- adjecitve
- Used to refer to people generally
- Being a strong example of (something mentioned)
- number
- Number 1
turn
US / tɜ:n /
•UK / tɚn /
- noun
- Place where changing of direction happens
- Your time or chance to perform a duty
- Your chance to play or do in say a game
- Unexpected change, as in the weather
- verb
- To become (a particular age)
- To become a different quality, color, etc.
- To change the direction of something, e.g. a car
- To move in an opposite direction or position
- To shape metal with a spinning tool
than
US / ðən /
•UK / ðən /
- conjunction
- Used to compare two things that are not equal
symmetrical
US / sɪˈmetrɪkl /
•UK / sɪˈmɛtrɪkəl /
- adjecitve
- Having parts that are exactly the same
this
US / ðɪs /
•UK / ðɪs /
- adjecitve
- Used to indicate something already been discussed
- Used to indicate something happening around now
- adverb
- An indication by a physical motion or gesture
- A specific amount of
- determiner
- Person, thing, or idea near you
- pronoun
- Person, thing that has already been discussed
term
US / tɜ:m /
•UK / tɚm /
- noun
- Conditions applying to an agreement, contract
- Length of time something is expected to happen
- Fixed period of weeks for learning at school
- The (precise) name given to something
- verb
- To call; give a name to
less
US / les /
•UK / lɛs /
- adjecitve
- Smaller in amount or degree
- adverb
- To a smaller degree
- noun
- A smaller amount
- preposition
- With the subtraction of
also
US / 'ɔ:lsəʊ /
•UK / ˈɔlso /
- adverb
- In addition; too; in a similar way
year
US / jə: /
•UK / jɪr /
- noun
- Unit of time equal to 12 months or 365 or 366 days
- Used to refer to the age of a person
you
US / jʊ /
•UK / ju /
- pronoun
- Person someone is speaking or writing to
- Person or people in general
let
US / let /
•UK / lɛt /
- verb
- To allow someone to do something
- Introducing a suggestion to do something together
- To rent a house, etc. to others
little
US / 'lɪtl /
•UK / ˈlɪtl /
- adjecitve
- Being short in length of time
- Not great in size, amount, or degree; small
- Being very young or younger than others
- adverb
- By an amount or degree that is not very much
- Not often; rarely
- noun
- A person's name
the
US / ðə /
•UK / ðə /
- article
- Used to refer to something already mentioned
- Used to show there is only one of something
- determiner
- Used to describe all of a family
cycle
US / ˈsaɪkl /
•UK / ˈsaɪkəl /
- noun
- Series of regular and repeated actions
- Bicycle, bike
- verb
- To go through a series of events repeatedly
- To ride on a bicycle
precession
US / prɪ'seʃən /
•UK / prɪ'seʃən /
- noun
- (Formal) going first in time, order or rank
talk
US / tɔ:k /
•UK / tɔk /
- noun
- Style of speaking
- Discussion between two countries
- Giving information in front of people; lecture
- Saying things or ideas to someone with words
- verb
- To make a formal speech about something
- To say things or ideas to someone with words
object
US / 'ɒbdʒɪkt /
•UK / ˈɑbdʒɪkt /
- noun
- Something you can see or touch, but is not alive
- Goal or purpose of a particular plan or activity
- The thing that the action of a verb acts upon
- verb
- To disagree; to protest against an idea or plan
discussion
US / dɪˈskʌʃn /
•UK / dɪˈskʌʃən /
- noun
- Any long communication about a particular topic
time
US / taɪm /
•UK / taɪm /
- noun
- Speed at which music is played; tempo
- Point as shown on a clock, e.g. 3 p.m
- Number of hours, minutes needed to do something
- Occasion when something happens
- Period or occasion that something occurred
- Period in history or the past
- Something measured in minutes, hours, days, etc.
- How long an event takes; duration
- verb
- To check speed at which music is performed
- To choose a specific moment to do something
- To measure how long an event takes, e.g. a race
- To schedule something to occur at a specific moment
why
US / waɪ /
•UK / hwaɪ, waɪ /
- adverb
- Question word to ask for a reason
- exclamation
- (Used to express surprise or approval)
fact
US / fækt /
•UK / fækt /
- noun
- Something that is known or proved to be true
earth
US / ɜ:θ /
•UK / ɚθ /
- noun
- Wire connecting an electrical device to the ground
- The planet we live on
- Soil in which we grow plants
system
US / 'sɪstəm /
•UK / ˈsɪstəm /
- adjecitve
- Working in an organized, logical way
- noun
- Set of organized, planned ideas that work together
asymmetry
US / ˌeɪ'sɪmətrɪ /
•UK / eˈsɪmɪtri /
- noun
- Being different on one side than the other
math
US / mæθ /
•UK / mæθ /
- noun
- Study or science of numbers and shapes
those
US / ðəʊz /
•UK / ðoz /
- determiner
- The people or things we are talking about
- pronoun
- The objects far from the speaker
pole
US / pəʊl /
•UK / pol /
- noun
- One of two opposite ideas, qualities or positions
- Most northern or most southern point on a planet
- A long, narrow piece of metal or wood
- One of two opposite magnetic forces
- An upright long thin structure to support things
- verb
- To move a boat with a stick or pole
video
US / 'vɪdɪəʊ /
•UK / ˈvɪdiˌo /
- adjecitve
- Of a moving film, with sound
- noun
- Recording capturing action with sound
- verb
- To make a moving film of, with sound
axial
US / ˈæksiəl /
•UK / ˈæksiəl /
- adjecitve
- Forming or rotating around an axis
our
US / 'aʊə(r) /
•UK / aʊr /
- determiner
- Belonging to us
not
US / nɒt /
•UK / nɑt /
- adverb
- Word indicating the negative
- (Used to form the negative of verbs)
whole
US / həul /
•UK / hol /
- adjecitve
- Complete or full; all of
- Being in a good condition
- noun
- Complete amount or sum; total
north
US / nɔ:θ /
•UK / nɔ:rθ /
- adjecitve
- Coming from the opposite direction to the south
- noun
- Direction to your left when facing the rising sun
really
US / ˈri:əli /
•UK / ˈriəˌli, ˈrili /
- adverb
- Used to stress something that is said; definitely
- In a true or accurate manner
- Very
physics
US / ˈfɪzɪks /
•UK / ˈfɪzɪks /
- other
- The study of heat, light, and energy on objects
measure
US / ˈmeʒə(r) /
•UK / ˈmɛʒɚ /
- noun
- Plan to achieve a desired result
- Tool used to calculate the size of something
- verb
- To determine the value or importance of something
- To calculate size, weight or temperature of
planet
US / 'plænɪt /
•UK / ˈplænɪt /
- noun
- One of the bodies that orbit the sun
south
US / saʊθ /
•UK / saʊθ /
- adjecitve
- Direction to your right when facing the rising sun
- Coming from the opposite direction from north
- noun
- The direction to your right of the rising sun
tall
US / tɔ:l /
•UK / tɔl /
- adjecitve
- High in height
but
US / bət /
•UK / bʌt,bət /
- conjunction
- Used before you say something different, opposite
could
US / kəd /
•UK / kʊd /
- other
- Past form of 'can' to mean have ability
- Used to ask for something politely, or to offer
diameter
US / daɪˈæmɪtə(r) /
•UK / daɪˈæmɪtɚ /
- noun
- Distance across the center of an object
see
US / si: /
•UK / si /
- verb
- To go on a date with someone
- To predict whether something is, or will be true
- To understand what someone says
- To use your eyes to look at something
- To visit a place often for sightseeing or pleasure
- To visit or meet with someone
- To find out by waiting or looking
- To watch (a game, movie or TV show)
have
US / həv /
•UK / hæv /
- verb
- To drink, smoke, eat or use something
- To experience the effects of something
- To organize an event, or join in an activity
- To own, possess, or hold something
- To cause to happen or produce a particular effect
next
US / nekst /
•UK / nɛkst /
- adverb
- The one that follows another in time or order
- At a time or place directly after the present one
- noun
- The one that follows after
- adjecitve
- Immediately after the previous one
- First occurrence after the present one
orbit
US / 'ɔ:bɪt /
•UK / ˈɔrbɪt /
- noun
- Path an object takes as it circles another object
- verb
- To go around another object (often in space)
with
US / wɪð /
•UK / wɪð, wɪθ /
- preposition
- As an employee of a certain company
- Against something or someone
- By using something as a means
- Due to; because of
- Including
- Possessing as a feature
- Related to
- (Of the manner/attitude by which you do something)
- Used to express that people or things are together
draw
US / drɔ: /
•UK / drɔ /
- noun
- Something that attracts people to visit a place
- A lottery or prize
- Result of a game, contest where the score is equal
- verb
- To attract attention to someone or something
- To get closer to or approach something or someone
- To influence a person's involvement in something
- To move an object by pulling
- To create an image using pen or pencil and paper
- To take one thing out of a container, etc.
- (Of 2 teams) to finish a game with the same score
byproduct
US / 'baɪˌprɒdʌkt /
•UK / ˈbaɪˌprɑdəkt /
- noun
- A waste product made from making something else
sun
US / sʌn /
•UK / sʌn /
- noun
- Light and heat coming from a large star in the sky
- Hot shining star the Earth moves around
- verb
- To lie in the sunshine and enjoy its warmth
approximately
US / əˈprɒksɪmətli /
•UK / əˈprɑksəmɪtlɪ /
- adverb
- Around; nearly; almost; about (a number)
equator
US / ɪ'kweɪtə(r) /
•UK / ɪˈkwetɚ /
- noun
- Geographical line at zero degrees latitude
call
US / kɔ:l /
•UK / kɔl /
- noun
- A order or request for action
- The sound an animal makes, often when in danger
- A correct prediction, e.g. a decision in a game
- A short visit to a place or person
- A decision by a referee or umpire in a game
- verb
- To make a request or order for action
- (Animal) to make sounds to warn of danger
- To announce the date of an election
- To make a judgment about something
- To give someone or something a name
- To guess in advance the result or outcome
- To visit a place or person for a short time
- To phone someone
- To speak, announce or shout in a loud voice
beyond
US / bɪ'jɒnd /
•UK / biˈɑnd, bɪˈjɑnd /
- adverb
- On or to the farther side
- In addition to
- preposition
- Later in time than
- Out of the limits of
along
US / əˈlɒŋ /
•UK / əˈlɔ:ŋ /
- adverb
- As a companion; taken with someone
- preposition
- At a point on a line
from
US / frəm /
•UK / frʌm, frɑm,frəm /
- preposition
- Starting at a particular place, time or level
out
US / aʊt /
•UK / aʊt /
- adverb
- No longer stylish (e.g. fashion)
- Away from home, business, or the usual place
- In a direction/movement away from inside or center
- noun
- Act when a batter cannot continue playing
- verb
- To tell people a secret
over
US / 'əʊvə(r) /
•UK / ˈovɚ /
- adverb
- Finished; no longer happening
- Towards the ground/away from a standing position
- noun
- A set of six consecutive balls bowled in cricket
- other
- Finished
- preposition
- Showing the relation when a thing is above another
- On or covering something
- Above or across something
- More than you need
- From one side to the other
- In the direction of; toward
and
US / ənd /
•UK / ənd, ən,ænd /
- conjunction
- Used to refer to two or more things
- Plus; in addition; on top of that
- Used to introduce an action that follows another
lot
US / lɒt /
•UK / lɑt /
- noun
- What happens to a person in life from chance; fate
- A group of people seen together
- Item for sale at an auction
- Small area of land used for a purpose e.g. parking
completely
US / kəmˈpli:tli /
•UK / kəmˈpliːtli /
- adverb
- In every way or as much as possible
only
US / ˈəunli /
•UK / ˈonli /
- adverb
- Just one; just that amount or thing; not more than
- Not very important or serious
- Just that type of thing, person
- Short time ago; not before a certain time
- conjunction
- Except; but
put
US / pʊt /
•UK / pʊt /
- phrasal verb
- to make a light stop shining by pressing or moving a switch
- verb
- To move or place a thing in a particular position
- To rate something in importance or value
- To write or say something in a certain manner
guess
US / ɡes /
•UK / ɡɛs /
- noun
- Answer given when you don't know if it is correct
- verb
- To give an answer without knowing if it is correct
thousand
US / ˈθaʊznd /
•UK / ˈθaʊzənd /
- number
- Number 1,000
will
US / wɪl /
•UK / wɪl /
- noun
- Desire or choice of someone
- Document saying who gets your money when you die
- Strong desire to do something; determination
- Desire to do something; strong wish to do
- other
- Used with verbs to express the future
- verb
- To leave property to someone after your death
- To use mental effort to make something happen
- Am (is, are) likely to do
- To influence someone to do something
- To make something happen by strongly wanting it
here
US / hɪə(r) /
•UK / hɪr /
- adverb
- In this place; at this location, position or time
actually
US / ˈæktʃuəli /
•UK / ˈæktʃuəli /
- adverb
- Used to add new (often different) information
equatorial
US / ˌekwəˈtɔ:riəl /
•UK / ˌikwəˈtɔriəl, -ˈtor-, ˌɛkwə- /
- adjecitve
- Concerning or at an equator; having hot weather
gravity
US / ˈgrævəti /
•UK / ˈɡrævɪti /
- noun
- (Of a situation) extreme seriousness
- Force making things fall towards the ground
inside
US / ˌɪn'saɪd /
•UK / ɪnˈsaɪd, ˈɪnˌsaɪd /
- adjecitve
- Being in something
- Being in a building
- adverb
- Into a house; indoors
- noun
- Inner part or surface of something
once
US / wʌns /
•UK / wʌns /
- adverb
- One time; one instance
- At a time in the past
- conjunction
- When; as soon as
inclination
US / ˌɪnklɪˈneɪʃn /
•UK / ˌɪn.klɪˈneɪ.ʃən /
- noun
- Feeling or desire to do something; a habit