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Calculation of the parallax

ESO: "Approximated method for the calculation of the parallax (with examples)", written by P. Rocher (IMCCE).

http://www.vt-2004.org/Background/Infol2/EIS-B4.html

Example:
City 1: Antananarivo: latitude 18° 52' S, longitude 47° 30' E
City 2: Helsinki: latitude60° 8' N, longitude 25° 3' E

1. Using the durations of the interior transits

2. Using the first contacts

 

City 1 deg min sec Latitude: N S Longitude: W E City 2 deg min sec Latitude: N S Longitude: W E Difference in duration of the interior transits (decimal minutes) Parallax (arcseconds): Sun distance (km): JavaScript computing time difference Steven van Roode made an Online Parallax Calculator on his website, which enables you to calculate the solar parallax by either Halley's or Delisle's principles.

52 N, 5 E: 7h 39m 35.0s, 13h 03m 54.0s

30 S, 20 E: 7h 36m 17.5s, 13h 10m 56.2s 

Updated: 2004 May 21

Juergen Giesen