9/5/2003
33.824, -98.544  994 ft.
Transparency 3/5  seeing 3/5

At 2:25 UT the lovely bowed terminator graced the area just west of the triple craters of Parry, Fra Mauro, and Bonpland. The striped shadows across the floor of Guericke resembled a multiple light ray in my Zeiss Jena C 63/840 Telementor at x178 so I decided to take a closer look. At x256 in the 203mm f/6 reflector I could resolve the shadows into two strong sunrise rays. The center shadow becoming parted midway across the crater floor creating a shorter ray extending >15Km west. The crater Guericke H was evident through the southern-most ray, as was the small dome just to the southeast of H. A few long shadows broken with intermittant beams of sunlight were showing in the high broken mountains to the north of Guericke in Mare Nubium. A stunning sight that lasted for the better part of a half hour. - David Ryle

Using the Lunar Observer's Toolkit:

Site Longitude = +98.544
Site Latitude = +33.824
Site Elevation = +252.000

Reproducing Lighting For: 2003/9/5 at 02:25 U.T.

Desired Solar Altitude =  +2.475(Rising),  Azimuth = +88.004

Feature = Guericke
Feature Longitude: = -14.100
Feature  Latitude: = -11.500

Average Co-longitude =  16.626

Moon's Altitude Restricted = Y Altitude =  +5.000 degrees

In the Time column, D=Daylight, T=Twilight

                      ---- Moon's ----    -- Earth's --
                        Topocentric        Topocentric      -------- Sun's --------
   UT Date    Time     Alt°   Semi-Diam''  Long°   Lat°     Colong°     Lat°    Azim°

 2003/09/05  02:25   +29.016    973.56    +3.463  +5.039    016.924   +1.461  +88.004

Guericke -239,-200: This formation is 36 miles in diameter with regular walls on the east, where there is an ancient ring, but with a gap on the south and a still wider gap on the west. This section of the wall has been reduced to the level of the plain. On the north wall is a peak of 2800 feet. Some distance to the south, is a crater,B. - Wilkins and Moore, The Moon, Faber and Faber, 1955