Stellarium Mercury 2nd contact 12:08:35. Others 12:15:36

Are you understand that time of 2nd contact will be different for different locations?

I had independent precomputation of first contact 13:12:04, Stellarium says 13:12:04 (UT+2). Pretty satisfying IMHO. Of course, light time correction, topocentric correction required. Journal should state "computed for long/lat...". My own photo timing should follow in the next few days.

Thanks for your comments.

Of course, but saying that the time will be different for different
locations is merely a comment on the sun being in a different place in
your local sky. Observers linked by wireless observing 2nd contact
would all say, 'Now!' (within nanoseconds) at exactly the same time,
wherever the sun was for them.

Probably this is just me placing too much reliance on the size given by
Stellarium to the sun.....

Regards,

John Watts

<email address hidden>
Skype: JS.Watts
Tel: +44 (0)20 8549 6501
Car: +44 (0)774 694 9715

Everything that is Proveable is True.
But not everything that is True is Proveable - and we can prove that.

On 09/05/2016 10:31, Alexander Wolf wrote:
> Your question #293478 on Stellarium changed:
> https://answers.launchpad.net/stellarium/+question/293478
>
> Status: Open => Needs information
>
> Alexander Wolf requested more information:
> Are you understand that time of 2nd contact will be different for
> different locations?
>

Sorry - nanoseconds? More like ten minutes. Foregt I ever raised this....

Regards,

John Watts

<email address hidden>
Skype: JS.Watts
Tel: +44 (0)20 8549 6501
Car: +44 (0)774 694 9715

Everything that is Proveable is True.
But not everything that is True is Proveable - and we can prove that.

On 10/05/2016 17:32, John Watts wrote:
> Your question #293478 on Stellarium changed:
> https://answers.launchpad.net/stellarium/+question/293478
>
> Status: Needs information => Open
>
> You gave more information on the question:
> Thanks for your comments.
>
> Of course, but saying that the time will be different for different
> locations is merely a comment on the sun being in a different place in
> your local sky. Observers linked by wireless observing 2nd contact
> would all say, 'Now!' (within nanoseconds) at exactly the same time,
> wherever the sun was for them.
>
> Probably this is just me placing too much reliance on the size given by
> Stellarium to the sun.....
>
> Regards,
>
> John Watts
>
> <email address hidden>
> Skype: JS.Watts
> Tel: +44 (0)20 8549 6501
> Car: +44 (0)774 694 9715
>
> Everything that is Proveable is True.
> But not everything that is True is Proveable - and we can prove that.
>
> On 09/05/2016 10:31, Alexander Wolf wrote:
>> Your question #293478 on Stellarium changed:
>> https://answers.launchpad.net/stellarium/+question/293478
>>
>> Status: Open => Needs information
>>
>> Alexander Wolf requested more information:
>> Are you understand that time of 2nd contact will be different for
>> different locations?
>>

First contact was accurate to the second (observing a series of 5-second-interval shots). I had some thin clouds around second contact which blurred the view, but again, it seems to fit perfectly. Could not observe exit.

I hope you got the whole point of transit experiments on trans-ocean explorations in previous centuries by now (actually featuring Venus transits, but the principle is the same).