View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
---|---|---|---|---|---|
0001371 | SkyChart | 1-Software | public | 14-10-02 02:33 | 14-10-02 08:03 |
Reporter | David | Assigned To | Patrick Chevalley | ||
Priority | normal | Severity | major | Reproducibility | have not tried |
Status | resolved | Resolution | no change required | ||
Platform | x86 | OS | Windows | OS Version | XP |
Product Version | 3.10 | ||||
Summary | 0001371: Hour angle jumps between AD 1582 and 1583 | ||||
Description | Impossible jump in star movements. | ||||
Steps To Reproduce | Great 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 | ||||
Tags | No tags attached. | ||||
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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 |
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 |