Proposal: Lunar/ Mars co-ordinates (like "geo")

> That would give us, say:
>
>         <span class="luna">
>                 <span class="geo">
>                         <span
class="latitude">37.386013</span>,
>                         <span
class="longitude">-122.082932</span>
>                 </span>
>         </span>
>

what is the reference point for longitude?
(I assume some reference point would have to be defined
equivalent to
Greenwich for geo on Earth)



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