Posted 04 February 2009 - 01:20 PM
Posted 04 February 2009 - 04:06 PM
The ray is nicely rendered.
Thank you for sharing.
Posted 04 February 2009 - 10:35 PM
I really like viewing these sunlight rays myself. Sketching them is a real challenge because of how quickly they evolve. Great job on this one.
Posted 05 February 2009 - 04:28 AM
An excelent observation of this interesting lunar phenomena associated with the crater Hesiodus. This lunar ray is impressive when caught at the right time. Thank you for sharing it with us all.
http://jeff.medkeff....unar/s_rays.htm (interesting article on lunar rays by Jeff Medkeff)
Posted 09 February 2009 - 03:22 AM
Very interesting rendering and artwork. Now I will look for this lighting effect in Hesiodus next month, thanks to your posting this! Sorry I missed this post by you earlier.
Also ironic that I just saw another interesting light ray in the crater Grimaldi for the first time on Saturday night.
I look forward to seeing your next observation and sketches.
Posted 09 February 2009 - 08:03 PM
Can I ask, did you just happen to catch this bright ray or did you plan in advance to sketch it, because you knew about the ray ahead of time from an ephemeris?
Posted 09 February 2009 - 11:32 PM
Posted 10 February 2009 - 01:54 AM
there exist a page in the net which gives the times of Hesiodus ray: http://www.lunar-occ...o/rays/rays.htm
Unforunately, not all times for Europe were given. So I decided to calculate the dates by myself. In many publications Harry Jamiesons Lunar Observer's ToolKit is recommended for this, but a free version seemed not to exist. I sended Harry an email, but got not an answer.
Finally I found an old DOS version of this programs. The algorithms are correct, so you can use it without limitations:
Posted 10 February 2009 - 02:10 AM
Thank you very much. I do know these sites associated with ALPO and have used them in the past myself. I was just wondering if you used them or other sites or if you just happened to catch the ray by sheer good luck. You answered my question. I have stumbled on this crater sunlight rays more often by luck. It seems that when I plan in advance I'm always clouded out. Thanks.