December 2005 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  16:12MS 16:28SS         18:13TE          5:45TS          7:31SR  9:15MR 11:31VT 
12- 2          16:28SS 17: 7MS 18:13TE          5:46TS          7:33SR 10:18MR 11:32VT 
12- 3          16:27SS         18:13TE 18:15MS  5:46TS          7:34SR 11: 7MR 11:31VT 
12- 4          16:27SS         18:13TE 19:34MS  5:48TS          7:34SR 11:43MR 10:13VT 
12- 5          16:27SS         18:13TE 20:57MS  5:49TS          7:35SR          8:52VT 
12- 6  12:13MR 16:27SS         18:13TE 22:19MS  5:49TS          7:37SR          7:30VT 
12- 7  12:34MR 16:27SS         18:13TE 23:37MS  5:50TS          7:37SR          6:13VT 
12- 8  12:55MR 16:27SS         18:13TE  0:54MS  5:52TS          7:39SR          4:58VT 
12- 9  13:13MR 16:25SS         18:13TE  2:10MS  5:52TS          7:40SR          3:42VT 
12-10  13:31MR 16:25SS         18:13TE  3:25MS  5:54TS          7:40SR          2:28VT 
12-11  13:52MR 16:27SS         18:13TE  4:40MS  5:54TS          7:41SR          1:13VT 
12-12  14:16MR 16:27SS         18:13TE          5:55TS  5:55MS  7:41SR          0: 0VT 
12-13  14:46MR 16:27SS         18:13TE          5:55TS  7:10MS  7:43SR          0: 0VT 
12-14  15:22MR 16:27SS         18:13TE          5:56TS          7:43SR  8:15MS  0: 0VT 
12-15  16:10MR 16:27SS         18:13TE          5:56TS          7:45SR  9:11MS  0: 0VT 
12-16          16:27SS 17: 7MR 18:15TE          5:58TS          7:45SR  9:56MS  0: 0VT 
12-17          16:28SS 18:10MR 18:15TE          5:58TS          7:46SR 10:31MS  0: 0VT 
12-18          16:28SS         18:16TE 19:17MR  5:58TS          7:46SR 10:58MS  1: 1VT 
12-19          16:28SS         18:16TE 20:25MR  6: 0TS          7:46SR 11:19MS  2: 8VT 
12-20          16:28SS         18:16TE 21:31MR  6: 0TS          7:48SR 11:37MS  3:15VT 
12-21          16:28SS         18:16TE 22:36MR  6: 1TS          7:48SR 11:52MS  4:19VT 
12-22          16:30SS         18:16TE 23:40MR  6: 1TS          7:49SR          5:23VT 
12-23  12: 8MS 16:31SS         18:17TE  0:45MR  6: 1TS          7:49SR          6:27VT 
12-24  12:23MS 16:31SS         18:19TE  1:52MR  6: 1TS          7:49SR          7:32VT 
12-25  12:40MS 16:31SS         18:19TE  3: 1MR  6: 1TS          7:49SR          8:42VT 
12-26  13: 1MS 16:31SS         18:19TE  4:16MR  6: 3TS          7:49SR          9:56VT 
12-27  13:28MS 16:32SS         18:21TE  5:34MR  6: 3TS          7:49SR         11:13VT 
12-28  14: 1MS 16:34SS         18:21TE          6: 3TS  6:50MR  7:49SR         11:41VT 
12-29  14:49MS 16:34SS         18:22TE          6: 3TS          7:49SR  8: 0MR 11:40VT 
12-30  16: 0MS 16:36SS         18:22TE          6: 4TS          7:50SR  8:57MR 11:41VT 
12-31          16:36SS 17:10MS 18:23TE          6: 4TS          7:50SR  9:41MR 11:40VT 

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.