# How to convert degree to kilometres

N

#### NinhTH

##### Member
Hello friend,
Do you know how to convert 1 degree to kilometres in space?
Ex: one satellite orbit is 130E and another 131E so how many kilometre between two satelite? thank you #### ozumo

##### Member
Distance of geostationary orbit to earth equator + distance from earth surface to the centre of the earth's core is your radius. Then work out diameter of a circle based on that radius, then divide by 360 for distance per degree. Of course that is distance around the circle's diameter, not in a straight line as the alien flies.

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• Lazarus and rolfw #### hvdh

##### Specialist Contributor
Clarke belt radius is 6378 km (earth at equator) + 35786 km (GEO altitude) = 42164 km.
Clarke belt circumference is 2 * pi * 42164 = 264924 km
1 degree on the belt is 264924 / 360 = 736 km
Note: this is the distance as measured on the belt (curved).

Distance in a straight line is
2 * 42164 * sin ( degree difference / 2 )

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• NinhTH, Lazarus and ozumo #### Lazarus

##### Tout Rond Bon Oeuf
Staff member

(Whoops, I just did, but think I might have got away with it)

• william-1 #### Analoguesat

Staff member
Wont be accurate to more than a few kms anyway seeing as every satellite moves continually around its nominal slot.

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#### NinhTH

##### Member
Clarke belt radius is 6378 km (earth at equator) + 35786 km (GEO altitude) = 42164 km.
Clarke belt circumference is 2 * pi * 42164 = 264924 km
1 degree on the belt is 264924 / 360 = 736 km
Note: this is the distance as measured on the belt (curved).

Distance in a straight line is
2 * 42164 * sin ( degree difference / 2 )
Thank you so much

A

#### a33

##### Specialised Contributor
Are you having plans of traveling there?

(Just curious to what you want to do with this knowledge...) Greetz,
A33

• • 4wd, jeallen01 and Lazarus #### Terryl

##### Specialist Contributor
Been there, not much going on these days.

• NinhTH, ozumo and a33