# Facts and formulas

Credit to edexcel exam board just there stuff in a new format

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• Created by: katie
• Created on: 03-06-14 22:49
Diameter of the Earth
13, 000km
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Diameter of the moon
3,500km
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Diameter of the Sun
1.4 million km
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Distance from the Earth to the Moon
380,000km
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Diastance from Earth to Sun
150 million km or 1AU
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Rotation period of Earth
23h 56mins
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Time for the Earth to rotate 1 degree
4 mins
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Moon's rotational and orbital period
27.3 days
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Complete lunar cycle
29.5 days
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Temperature of the Sun's photosphere
5,800K
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Approximate temperature of the corona
2 million K
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Kepler's third law
T²=R³ T=time in years R=distance in AU
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Circumpolar stars
declination> 90-latitude
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Magnitude
M=m+5-5logd m=apparent magnitude M=absolute magnitude d=distance
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recorded wavelength-actual wavelength/actual wavelength=radial velocity/speed of light
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Hubble's law
v=Hd v=velocity d=distance H=hubble's constant
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## Other cards in this set

### Card 2

3,500km

#### Back

Diameter of the moon

1.4 million km

380,000km

### Card 5

#### Front

150 million km or 1AU