by Joe Stieber » Thu Jun 25, 2015 1:39 am
LUZLUX wrote:Hi, Mi name is Fernando Rey and i´m the author of this photograph.
The image was shot exactly on June 20th 2015 at 23:20:46h...
Fernando,
I was wondering, what time zone is the reported 23:20:46 on June 20th? CET (Central European Time, UT+1) or CEST (Central European Summer Time, UT+2)?
Looking at the scene with SkyTools set for the nearby city of Vigo, Spain (using the coordinates from Wikipedia), and a current time zone of CEST (UT+2) as indicated by several internet time sites, the picture matches SkyTools at 00:20 CEST on June 21st. In particular, the altitude of the moon is much the same as its spacing from Jupiter (4 deg 31 min altitude, 5 deg 15 min spacing). In contrast, at 23:20 CEST on June 20th, the moon was 15 deg 31 min altitude, three times its distance from Jupiter.
Of course, if you're using CET, there's no problem. I have no local knowledge of the area and the park, so perhaps it does not observe summer time for some reason. Or perhaps the time is being taken from the EXIF data and the camera's clock is still on standard time? I come across this with surprising frequency when looking at pictures taken by others. The posted picture does not show the time in the EXIF data (evidently lost in processing).
Finally, looking at the full-size image enlarged, the stars actually appear to be rows of four or five dots, as if the picture is a combination of multiple exposures, but not stacked on the stars. Is this actually the case?
Joe Stieber
[quote="LUZLUX"]Hi, Mi name is Fernando Rey and i´m the author of this photograph.
The image was shot exactly on June 20th 2015 at 23:20:46h...[/quote]
Fernando,
I was wondering, what time zone is the reported 23:20:46 on June 20th? CET (Central European Time, UT+1) or CEST (Central European Summer Time, UT+2)?
Looking at the scene with SkyTools set for the nearby city of Vigo, Spain (using the coordinates from Wikipedia), and a current time zone of CEST (UT+2) as indicated by several internet time sites, the picture matches SkyTools at 00:20 CEST on June 21st. In particular, the altitude of the moon is much the same as its spacing from Jupiter (4 deg 31 min altitude, 5 deg 15 min spacing). In contrast, at 23:20 CEST on June 20th, the moon was 15 deg 31 min altitude, three times its distance from Jupiter.
Of course, if you're using CET, there's no problem. I have no local knowledge of the area and the park, so perhaps it does not observe summer time for some reason. Or perhaps the time is being taken from the EXIF data and the camera's clock is still on standard time? I come across this with surprising frequency when looking at pictures taken by others. The posted picture does not show the time in the EXIF data (evidently lost in processing).
Finally, looking at the full-size image enlarged, the stars actually appear to be rows of four or five dots, as if the picture is a combination of multiple exposures, but not stacked on the stars. Is this actually the case?
Joe Stieber