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AStronomical numbers
Numbers you need to know for GCSE Astronomy
11
Astronomy
11th Grade
05/01/2013
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Term
Diameter of the Earth
 Definition
13000 km
Term
Diameter of the moon
 Definition
3500 km
Term
Diameter of the Sun
 Definition
1.4 million km
Term
Distance from Earth to moon
 Definition
380 000 km
Term
Distance from Earth to Sun (1 astronomical unit)
 Definition
150 million km
Term
Rotational period (sidereal day) of the Earth
 Definition
23 hours 56 minutes
Term
Time for Earth to rotate through 1 degree
 Definition
4 minutes
Term
Moon's rotational period (sidereal day)and time to orbit the Earth
 Definition
27.3 days
Term
Period of the lunar cycle
 Definition
29.5
Term
Temperature of the Sun's photosphere
 Definition
5800 Kelvin
Term
Approximate temperature of the Sun's Corona
 Definition
2 million Kelvin
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