December 2009 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  15:53MR 16:28SS         18:13TE          5:45TS          7:31SR  8:15MS  0: 0VT 
12- 2          16:28SS 16:45MR 18:13TE          5:46TS          7:33SR  9:17MS  0: 0VT 
12- 3          16:27SS 17:55MR 18:13TE          5:46TS          7:34SR 10: 7MS  0: 0VT 
12- 4          16:27SS         18:13TE 19:13MR  5:48TS          7:34SR 10:46MS  0:59VT 
12- 5          16:27SS         18:13TE 20:34MR  5:49TS          7:35SR 11:16MS  2:21VT 
12- 6          16:27SS         18:13TE 21:52MR  5:49TS          7:37SR 11:41MS  3:39VT 
12- 7          16:27SS         18:13TE 23:10MR  5:50TS          7:37SR          4:57VT 
12- 8  12: 4MS 16:27SS         18:13TE  0:25MR  5:52TS          7:39SR          6:11VT 
12- 9  12:26MS 16:25SS         18:13TE  1:37MR  5:52TS          7:40SR          7:24VT 
12-10  12:49MS 16:25SS         18:13TE  2:49MR  5:54TS          7:40SR          8:36VT 
12-11  13:13MS 16:27SS         18:13TE  4: 1MR  5:54TS          7:41SR          9:48VT 
12-12  13:40MS 16:27SS         18:13TE  5:11MR  5:55TS          7:41SR         10:58VT 
12-13  14:13MS 16:27SS         18:13TE          5:55TS  6:19MR  7:43SR         11:42VT 
12-14  14:52MS 16:27SS         18:13TE          5:56TS  7:19MR  7:43SR         11:43VT 
12-15  15:45MS 16:27SS         18:13TE          5:56TS          7:45SR  8:11MR 11:43VT 
12-16          16:27SS 16:37MS 18:15TE          5:58TS          7:45SR  8:55MR 11:43VT 
12-17          16:28SS 17:37MS 18:15TE          5:58TS          7:46SR  9:30MR 11:44VT 
12-18          16:28SS         18:16TE 18:40MS  5:58TS          7:46SR  9:57MR 11:18VT 
12-19          16:28SS         18:16TE 19:45MS  6: 0TS          7:46SR 10:22MR 10:15VT 
12-20          16:28SS         18:16TE 20:49MS  6: 0TS          7:48SR 10:43MR  9:10VT 
12-21          16:28SS         18:16TE 21:52MS  6: 1TS          7:48SR 11: 1MR  8: 8VT 
12-22          16:30SS         18:16TE 22:55MS  6: 1TS          7:49SR 11:19MR  7: 5VT 
12-23          16:31SS         18:17TE 23:58MS  6: 1TS          7:49SR 11:38MR  6: 3VT 
12-24          16:31SS         18:19TE  1: 4MS  6: 1TS          7:49SR          4:57VT 
12-25  12: 0MR 16:31SS         18:19TE  2:13MS  6: 1TS          7:49SR          3:48VT 
12-26  12:23MR 16:32SS         18:19TE  3:25MS  6: 3TS          7:49SR          2:37VT 
12-27  12:53MR 16:32SS         18:21TE  4:37MS  6: 3TS          7:49SR          1:25VT 
12-28  13:33MR 16:34SS         18:21TE  5:50MS  6: 3TS          7:49SR          0:12VT 
12-29  14:23MR 16:34SS         18:22TE          6: 3TS  6:58MS  7:49SR          0: 0VT 
12-30  15:34MR 16:36SS         18:22TE          6: 4TS          7:50SR  7:55MS  0: 0VT 
12-31          16:37SS 16:45MR 18:23TE          6: 4TS          7:50SR  8:38MS  0: 0VT 

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.