Click to Visit World of Science
Tonight's Sky for Friday December 10, 1999 - NORTHERN Hemisphere

Tonight's Sky for Friday December 10, 1999 - NORTHERN Hemisphere

Earth & Sky home | Search Earth & Sky

View printable form

[Star display]

FRIDAY, DECEMBER 10, 1999 -- 45 MINUTES AFTER SUNSET LOOKING SOUTHWEST. In November, Steve Ludwig in Phoenix asked whether -- on any single day -- you can tell if the moon is "waning" or "waxing" just by looking at it. The answer to that is yes, and I gave a long-winded explanation a month ago on what to look for. Since then, I've heard from a couple of fellow skywatchers with much more succinct explanations than mine! Sally Lieb in Florida wrote, "A friend once told me . . . a waxing moon looks like a b (rounded side on the right) while a waning moon looks like a d (rounded side on the left)." And David Auker in Portland, Oregon, wrote, "I think . . . I remember an easy bit of a poem that goes something like 'moon's horns pointing west: moon heading towards rest; horns pointing east: its size will be increased."' Yeah! Thanks, Sally and David! I hope Steve Ludwig is reading. By the way, if you see the moon this evening, notice that it looks like a "b" (rounded on the right). Its horns are pointing east. Voila! It's a waxing moon.
Previous Tonight's Sky | Skywatching Center | Next Tonight's Sky
Images created using "Starry Night Deluxe" by Sienna Software.

Let us know what you think!

© Byrd & Block Communications, Inc. Permission to use, copy and distribute these materials without fee is hereby granted, provided that the above copyright notice appear in all copies and the materials are not redistributed for profit.