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Forum: Tech Log

18th Apr 2016, 14:12

Replies: 12

astronomical/ephemerides algorithm

Views: 3,411

Posted By roulishollandais

Of course ! Eratosthenes knew that earth was...

Of course ! Eratosthenes knew that earth was spheric, and understood what latitude is !
He did not use a verticasl stick but a vertical hole in Syena at summer solstice and distance to Alexandria...

Forum: Tech Log

18th Apr 2016, 08:46

Replies: 12

astronomical/ephemerides algorithm

Views: 3,411

Posted By roulishollandais

Exactly ! But imagine the shade of a style...

Exactly ! But imagine the shade of a style passing on the top of that awesome stick , parallel to the poles' axis. (That style is going toward North direction and angle with the horizontal plane is...

Forum: Tech Log

17th Apr 2016, 19:52

Replies: 12

astronomical/ephemerides algorithm

Views: 3,411

Posted By roulishollandais

Two words are used in french to describe the...

Two words are used in french to describe the profession consisting in doing sundials :
1. The Gnomoniste's work is to calculate the exact position and informations who figure on the sundial.
2. The...

Forum: Tech Log

16th Apr 2016, 12:39

Replies: 12

astronomical/ephemerides algorithm

Views: 3,411

Posted By roulishollandais

I' m using Meeus' algorythms : OK For sundials...

I' m using Meeus' algorythms : OK
For sundials and equation of time I'm using Denis Savoye algorithms (some mistakes in the first edition, but corrected in the last edition).
I wrote some tens of...

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