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# Unsure of what the ground points are and how they are calculated (ISS location) Watch

1. Hi there .

I am looking at the International Space Station and wondered what the attached info all means. Mainly the what the ground point is and how it is calculated.

Also, why are there two orbital speeds?

Thanks

**website you can view it on is http://iss.astroviewer.net/ ***
2. ground point is where it is hovering over earth

two orbital speeds are given because they're in different units, it has one true orbital speed

position is just found out using trig and GPS which ping the ISS and figure out where it is using algorithms and general relativity and stuff

also ground stations will ping it and use doppler shift and stuff to figure out where it is relative to the ground
3. (Original post by marcus888)

Hi there .

I am looking at the International Space Station and wondered what the attached info all means. Mainly the what the ground point is and how it is calculated.

Also, why are there two orbital speeds?

Thanks

**website you can view it on is http://iss.astroviewer.net/ ***
They are the same speed in different units.

4.765 miles per sec * 3600 sec/hour = 17155 mph
4. (Original post by Zacken)
They are the same speed in different units.

4.765 miles per sec * 3600 sec/hour = 17155 mph
Ah thanks .

Do you know what the ground points are?
5. (Original post by marcus888)
Ah thanks .

Do you know what the ground points are?
See the post above mine.

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