Science topic 1
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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What is frame of reference
A set of axis of any kind that is used to describe the positions or motions of things
What are celestial bodies?
The sun, moon, stars, and planets
What is a constellation?
The stars make unchanging patterns in the sky orien, hunter, little dipper
How did stars help with the creations of calendars?
Each day a star sets and rises four minutes earlier than the day before
What is the longest day of the year?
Summer solstice
What is azimuth?
Azimuth is an angle measured clockwise from north
What is altitude?
The angle above the horizon in degrees is altitude
What do you use to measure altitude?
An astrolabe
What do you use to measure azimuth?
A compass
What is geocentric
earth centred model
Who came up with the geocentric model
Aristole
What is heliocentric?
The sun centred model
Who came up with heliocentric?
Copernicus