How to calculate opposing planetary coords?

[uvelius]

I need to calculate the exact co-ordinations that are *opposite* to my current position on surface, on the other side of the planet.
Anyone having a formula at hand?

[smartroad]

https://forums.frontier.co.uk/showthrea ... oordinates

May help?

[de Carabas]

There must be a heading calculator already done for that as well somewhere. If not, I'll knock one up.

[Loriath]

There must be a heading calculator already done for that as well somewhere. If not, I'll knock one up.

There is. http://edbearingcalc.neocities.org/ However is does not give the opposite position.

[de Carabas]

Well, this killed a couple of hours that I should have been doing something else....



Useful to anyone else?

As to the coordinates on the other side of the planet, isn't it just current location plus 180 degrees on both axis (with wraping around at +-180 longitude and +-90 on the latitude)? Although I can't think what the formula would be

[Daniel Dakota]

Well, this killed a couple of hours that I should have been doing something else....



Useful to anyone else?

As to the coordinates on the other side of the planet, isn't it just current location plus 180 degrees on both axis (with wraping around at +-180 longitude and +-90 on the latitude)? Although I can't think what the formula would be

Nice one bud, count me in as a customer

Regards
DD

[de Carabas]

Here's a link to the quick and dirty v1. So quick and dirty it doesn't have an icon or even a proper home.
https://dl.dropboxusercontent.com/u/312 ... netNav.zip

I'll make it a little neater soon.

[Daniel Dakota]

Thanks very much bud, I hesitate to say "your tool will make an old man happy" ^^

In fact I won't ...

But it will

Regards
DD

[de Carabas]

Thanks very much bud, I hesitate to say "your tool will make an old man happy" ^^

In fact I won't ...

But it will

Regards
DD

Yeah, please don't say that...

It needs a bit of testing. I got a small amount of time last night and the one attempt looked right. My calculations match those in the spreadsheet linked to above BUT the results look different to the example I found on the French website,with an existing tool. Either one is wrong or is using the lat/long the wrong way round perhaps. Anyway, next version will get a thread of its own and and I'll ask for any tweaks wanted etc there

[Daniel Dakota]

I should be able to do some tests in the next couple of days, Ancient ruins visit etc