December 2004 Dark Sky Observing Time

The dark sky table shows the Pacific Standard Time (PST) times for sunset, astronomical twilight ends, astronomical twilight starts, sunrise, moonrise, moonset and total moon-free, twilight-free viewing time for Portland, Oregon, U.S.A. (Longitude: West 122.68 degrees & Latitude: North 45.52 degrees). Moon-free, twilight-free viewing time is the best time to observer deep sky objects because the moon light and twilight will not interfere with observing these faint objects.

Format:  ##:##SS = Sunset     ##:##TE = Twilight Ends    ##:##MR = Moonrise             
         ##:##SR = Sun Rise   ##:##TS = Twilight Starts  ##:##MS = Moonset
         ##:##VT = Moon-free, Twilight-free Viewing Time                  

Date            Sunset        Twilight Ends    Twilight Starts  Sun Rise  Viewing Time

12- 1          16:28SS         18:13TE 20:34MR  5:46TS          7:31SR          2:20VT 
12- 2  12:15MS 16:28SS         18:13TE 21:40MR  5:46TS          7:33SR          3:27VT 
12- 3  12:37MS 16:27SS         18:13TE 22:47MR  5:48TS          7:34SR          4:34VT 
12- 4  12:55MS 16:27SS         18:13TE 23:55MR  5:49TS          7:34SR          5:42VT 
12- 5  13:13MS 16:27SS         18:13TE  1: 4MR  5:49TS          7:35SR          6:51VT 
12- 6  13:31MS 16:27SS         18:13TE  2:15MR  5:49TS          7:37SR          8: 1VT 
12- 7  13:49MS 16:27SS         18:13TE  3:30MR  5:50TS          7:37SR          9:16VT 
12- 8  14:10MS 16:25SS         18:13TE  4:49MR  5:52TS          7:39SR         10:35VT 
12- 9  14:36MS 16:25SS         18:13TE          5:52TS  6:13MR  7:40SR         11:39VT 
12-10  15: 8MS 16:25SS         18:13TE          5:54TS  7:37MR  7:40SR         11:40VT 
12-11  16: 1MS 16:27SS         18:13TE          5:55TS          7:41SR  8:56MR 11:41VT 
12-12          16:27SS 16:53MS 18:13TE          5:55TS          7:43SR 10: 0MR 11:41VT 
12-13          16:27SS 18: 8MS 18:13TE          5:55TS          7:43SR 10:49MR 11:42VT 
12-14          16:27SS         18:13TE 19:31MS  5:56TS          7:43SR 11:25MR 10:25VT 
12-15          16:27SS         18:15TE 20:55MS  5:56TS          7:45SR 11:52MR  9: 1VT 
12-16          16:27SS         18:15TE 22:16MS  5:58TS          7:46SR          7:41VT 
12-17  12:13MR 16:28SS         18:15TE 23:31MS  5:58TS          7:46SR          6:27VT 
12-18  12:33MR 16:28SS         18:16TE  0:43MS  5:58TS          7:46SR          5:15VT 
12-19  12:49MR 16:28SS         18:16TE  1:54MS  6: 0TS          7:46SR          4: 5VT 
12-20  13: 7MR 16:28SS         18:16TE  3: 2MS  6: 0TS          7:48SR          2:57VT 
12-21  13:28MR 16:30SS         18:16TE  4:11MS  6: 1TS          7:48SR          1:49VT 
12-22  13:49MR 16:30SS         18:17TE  5:19MS  6: 1TS          7:49SR          0:41VT 
12-23  14:16MR 16:31SS         18:17TE          6: 1TS  6:26MS  7:49SR          0: 0VT 
12-24  14:49MR 16:31SS         18:19TE          6: 1TS  7:30MS  7:49SR          0: 0VT 
12-25  15:31MR 16:31SS         18:19TE          6: 1TS          7:49SR  8:25MS  0: 0VT 
12-26  16:22MR 16:32SS         18:19TE          6: 3TS          7:49SR  9:11MS  0: 0VT 
12-27          16:32SS 17:21MR 18:21TE          6: 3TS          7:49SR  9:48MS  0: 0VT 
12-28          16:34SS         18:21TE 18:25MR  6: 3TS          7:49SR 10:16MS  0: 4VT 
12-29          16:34SS         18:22TE 19:31MR  6: 3TS          7:50SR 10:40MS  1: 8VT 
12-30          16:36SS         18:22TE 20:37MR  6: 4TS          7:50SR 11: 1MS  2:15VT 
12-31          16:37SS         18:23TE 21:43MR  6: 4TS          7:50SR 11:19MS  3:19VT 

This Dark Sky table may print better in landscape orientation. Also, when printing using Netscape check the Black Text option in the File menu, Page Setup... menu in order to print the white text. This Dark Sky table was created by Dave Heider's Dark Sky DOS program. Download the Dark Sky DOS program to create your own unique Dark Sky tables for your location and time of observing.