August 18, 1999: I was observing the lunar terminator at 20:25 EST and observed what I believe was a sunrise ray to the southeast of the Alps Valley. The ray originated from the western face of the Alps Mountains just to northwest of Mt. Blanc (approx. 46.5 deg. north latitude and 0.5 deg. west longitude). The ray extended approximately 50 km northwesterly from the mountains out onto Mare Imbrium. Initially, I thought there was a mountain ridge that was catching the early morning sunlight, but after looking closely at Rukl's "Atlas of the Moon" (chart 12) it was obvious that this area is reasonably flat (there's no wrinkle ridge near this area). I was using my 12.5-inch Dobsonian at 200X. - Larry B Smith

Larry states the date and time as 8/18/99 @ 20:25 EST; this is 08/19/99 @00:25 UT, which is used in the predictions. The sun though shows a -1° solar altitude, which means it is still below the horizon. If I adjust the time to 4:00UT the sun is just cracking the horizon (Reproducing Lighting For: 1999/8/19 at 04:00 U.T. Desired Solar Altitude = +0.255(Rising), Azimuth = +89.757 Average Co-longitude = 359.871) More observations of this ray are needed to ascertain an average time of visibility.

Site Longitude = +75.800
Site Latitude = +49.150


Feature = 
Feature Longitude: =  +0.500
Feature  Latitude: = +46.500

Reproducing Lighting For: 1999/8/19 at 00:25 U.T.

Desired Solar Altitude =  -1.003(Rising),  Azimuth = +88.437
Average Co-longitude =  358.043

No description of feature