by alter-ego » Mon Jul 21, 2014 1:27 am
DavidLeodis wrote:It's an excellent photo.
I do though have a query about it. In the image's Exif data that I was able to find it states the image create date was July 13 2014 8:32:59 PM (timezone not specified). If that was the local time then it would have been 6:32:59 PM under Universal Time (UT), as Alicante was 2 hours ahead of UT. In information that I've found, that Full Moon was on July 12 2014 at 11:25 UT. If the Exif data is correct then the image was taken about 31 hours after the Full Moon (or 33 hours if the Exif time is under UT). Would it still seem to be a Full Moon so long after
A good observation David.
I think the answer is simply the correct timestamp (camera clock) setting / location cannot be determined, and the picture was actually taken on the 12th.
The APOD shows a moon ~2.1° above the horizon, and if taken on July 13, the corresponding time would 22:20 CEST (20:20pm UT) with the sun ~9.5°below the horizon. Both the lack of lunar phase visibility and possibly the residual sunset illumination on the beach don't fit well with the 13th as is indicated by the ephemeris images below.
- July 13, Local time 10:20pm (note that Mare Crisium is very near the illuminated edge)
If image were taken on 7/12, it would have been at 21:33 CEST (19:33 UT), with the sun ~1.2° below the horison . Here, the apparent phase, skylight and beach illumination seems more in line.
- July 12, Local time 9:33pm - Mare Crisium is well inside the illuminated edge.
I'll add that if the dates in question were July 11th & 12th the differentiation in phase visibility is significantly reduced, i.e. we probably couldn't tell any difference in apparent "fullness."
Hope this helps.
[quote="DavidLeodis"]It's an excellent photo.
I do though have a query about it. In the image's Exif data that I was able to find it states the image create date was July 13 2014 8:32:59 PM (timezone not specified). If that was the local time then it would have been 6:32:59 PM under Universal Time (UT), as Alicante was 2 hours ahead of UT. In information that I've found, that Full Moon was on July 12 2014 at 11:25 UT. If the Exif data is correct then the image was taken about 31 hours after the Full Moon (or 33 hours if the Exif time is under UT). Would it still seem to be a Full Moon so long after :?:[/quote]
A good observation David.
I think the answer is simply the correct timestamp (camera clock) setting / location cannot be determined, and the picture was actually taken on the 12th.
The APOD shows a moon ~2.1° above the horizon, and if taken on July 13, the corresponding time would 22:20 CEST (20:20pm UT) with the sun ~9.5°below the horizon. Both the lack of lunar phase visibility and possibly the residual sunset illumination on the beach don't fit well with the 13th as is indicated by the ephemeris images below.
[attachment=1]test.png[/attachment]
If image were taken on 7/12, it would have been at 21:33 CEST (19:33 UT), with the sun ~1.2° below the horison . Here, the apparent phase, skylight and beach illumination seems more in line.
[attachment=0]test3.png[/attachment]
I'll add that if the dates in question were July 11th & 12th the differentiation in phase visibility is significantly reduced, i.e. we probably couldn't tell any difference in apparent "fullness."
Hope this helps.