December 2011 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  12: 4MR 16:28SS         18:13TE 23:46MS  5:45TS          7:31SR          5:58VT 
12- 2  12:26MR 16:28SS         18:13TE  0:49MS  5:46TS          7:31SR          4:57VT 
12- 3  12:49MR 16:28SS         18:13TE  1:51MS  5:46TS          7:33SR          3:55VT 
12- 4  13:11MR 16:27SS         18:13TE  2:50MS  5:48TS          7:34SR          2:57VT 
12- 5  13:36MR 16:27SS         18:13TE  3:52MS  5:49TS          7:34SR          1:56VT 
12- 6  14: 3MR 16:27SS         18:13TE  4:54MS  5:49TS          7:35SR          0:55VT 
12- 7  14:34MR 16:27SS         18:13TE          5:50TS  5:54MS  7:37SR          0: 0VT 
12- 8  15:10MR 16:27SS         18:13TE          5:52TS  6:52MS  7:37SR          0: 0VT 
12- 9  15:58MR 16:25SS         18:13TE          5:52TS          7:39SR  7:45MS  0: 0VT 
12-10          16:25SS 16:46MR 18:13TE          5:52TS          7:40SR  8:33MS  0: 0VT 
12-11          16:25SS 17:43MR 18:13TE          5:54TS          7:40SR  9:15MS  0: 0VT 
12-12          16:27SS         18:13TE 18:46MR  5:55TS          7:41SR  9:51MS  0:33VT 
12-13          16:27SS         18:13TE 19:53MR  5:55TS          7:43SR 10:22MS  1:40VT 
12-14          16:27SS         18:13TE 21: 2MR  5:55TS          7:43SR 10:51MS  2:49VT 
12-15          16:27SS         18:13TE 22:13MR  5:56TS          7:43SR 11:16MS  4: 0VT 
12-16          16:27SS         18:15TE 23:25MR  5:58TS          7:45SR 11:43MS  5:10VT 
12-17          16:28SS         18:15TE  0:38MR  5:58TS          7:46SR          6:22VT 
12-18  12:10MS 16:28SS         18:15TE  1:52MR  5:58TS          7:46SR          7:37VT 
12-19  12:40MS 16:28SS         18:16TE  3: 7MR  5:58TS          7:46SR          8:51VT 
12-20  13:13MS 16:28SS         18:16TE  4:24MR  6: 0TS          7:46SR         10: 7VT 
12-21  13:55MS 16:28SS         18:16TE  5:37MR  6: 0TS          7:48SR         11:20VT 
12-22  14:45MS 16:30SS         18:16TE          6: 1TS  6:43MR  7:48SR         11:44VT 
12-23  15:48MS 16:30SS         18:17TE          6: 1TS  7:41MR  7:49SR         11:43VT 
12-24          16:31SS 16:52MS 18:17TE          6: 1TS          7:49SR  8:29MR 11:44VT 
12-25          16:31SS 18: 2MS 18:19TE          6: 1TS          7:49SR  9: 7MR 11:42VT 
12-26          16:31SS         18:19TE 19:13MS  6: 1TS          7:49SR  9:38MR 10:48VT 
12-27          16:32SS         18:19TE 20:23MS  6: 3TS          7:49SR 10: 6MR  9:39VT 
12-28          16:34SS         18:21TE 21:31MS  6: 3TS          7:49SR 10:30MR  8:31VT 
12-29          16:34SS         18:22TE 22:34MS  6: 3TS          7:49SR 10:52MR  7:28VT 
12-30          16:34SS         18:22TE 23:37MS  6: 3TS          7:50SR 11:15MR  6:25VT 
12-31          16:36SS         18:22TE  0:39MS  6: 4TS          7:50SR 11:38MR  5:25VT 

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.