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IDProjectCategoryView StatusLast Update
0001371SkyChart1-Softwarepublic14-10-02 08:03
ReporterDavid Assigned ToPatrick Chevalley  
PrioritynormalSeveritymajorReproducibilityhave not tried
Status resolvedResolutionno change required 
Platformx86OSWindowsOS VersionXP
Product Version3.10 
Summary0001371: Hour angle jumps between AD 1582 and 1583
DescriptionImpossible jump in star movements.
Steps To ReproduceGreat software, thanks, but from Papeete (Lat 17° 32'S; Long 149° 34' W), at UTC12h 17m 34s, looking West at Betelgeuse and Aldebarran, between AD 1582 and AD 1583 these stars jump by Az 3°; Alt 9° approx. when the time is stepped forward by one year. The hour angle changes from 05h 29m 31s to 04h 49m 05s which is implausible. I wonder if you could help?
Many thanks,
David
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Patrick Chevalley

14-10-02 08:03

administrator   ~0002952

This is because of the change from the Julian to the Gregorian calendar.
The day after October 4 1582 is October 15 1582, so the year 1582 is only 355 days long to correct for the cumulated error on the equinox day.
See http://en.wikipedia.org/wiki/Gregorian_calendar

Issue History

Date Modified Username Field Change
14-10-02 02:33 David New Issue
14-10-02 08:03 Patrick Chevalley Note Added: 0002952
14-10-02 08:03 Patrick Chevalley Assigned To => Patrick Chevalley
14-10-02 08:03 Patrick Chevalley Status new => resolved
14-10-02 08:03 Patrick Chevalley Resolution open => no change required