Burnham will be hard to find at sunrise. This small crater is located at the southwest corner of Rukl's map 45, approximately at Selenographic latitude 14 south, Selenographic latitude 7 east. The obvious nearby landmarks for finding it are the great craters on the east side of Mare Nubium, but they will be in darkness. I suggest observers first locate the prominent crater pair Theophilus and Cyrillus, south of Mare Tranquillitatis (on Rukl map 46), scan west (toward the terminator -- that's Lunar west, not celestial west) for about one and a half times their combined length, to Abulfeda (on Rukl map 45), then crater-hop not quite that same distance west again, to find Burnham along the terminator. The small triple crater comprised of Vogel, Vogel B, and an unnamed crater adjoining Vogel to the south, may serve as a landmark.
See also the L'ALPA page on the Burnham ray (in Italian) for timing predictions.
I observed the Halley Ray again on July 11, 1997 at about 9:15pm PDT. (The prediction for the Burnham Ray that night had been approximately 5pm.) Find Halley on the border between Albategnius and Hipparchus, the last and largest in a smooth arc of four or five craters of steadily increasing size which terminate at Halley (all of which will be lit except Halley, when the ray is occurring). The floor of Halley was dark except where it was bisected by a thick ray of light.
|Chart 44||Moon-Lite Atlas for chart 45||Chart 46|