spacecraft missions data updated, new key graticule added

[MithunBaadkar]

Title: Updated spacecraft_missions.json , New key called graticule added to every object

• There are some data or keys and values are missing in spacecraft_missions.json file so I have updated some keys and values in it.

New key was added called Graticule

• Graticule contain Map data or Geographic coordinates where the spacecraft was launched.
• This data is helpful if users integrate maps to point out the location.

[AdityaAsopa]

Hey @MithunBaadkar — great addition! Geographic coordinates for launch sites are definitely useful for map-based visualizations. I remember looking for such information a while back.

I wanted to flag a potential conflict: my PR #65 also modifies spacecraft_missions.json as part of a broader data normalization effort (ISO dates, consistent field names, numeric mass/power values). If either PR merges before the other, a rebase will be needed.

One thought on the graticule field: since these are launch site coordinates (not spacecraft orbital positions), it might be clearer to name it launch_site_coordinates or similar — but that's a minor suggestion for the maintainers to weigh in on.

Happy to coordinate if it helps get both contributions merged cleanly.