December 2008 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 19:53MS  5:46TS          7:31SR 11:21MR  9:52VT 
12- 2          16:28SS         18:13TE 21: 0MS  5:46TS          7:33SR 11:43MR  8:46VT 
12- 3          16:27SS         18:13TE 22: 6MS  5:48TS          7:34SR          7:41VT 
12- 4  12: 4MR 16:27SS         18:13TE 23:13MS  5:49TS          7:34SR          6:35VT 
12- 5  12:22MR 16:27SS         18:13TE  0:22MS  5:49TS          7:35SR          5:27VT 
12- 6  12:40MR 16:27SS         18:13TE  1:32MS  5:49TS          7:37SR          4:16VT 
12- 7  13: 1MR 16:27SS         18:13TE  2:46MS  5:50TS          7:37SR          3: 4VT 
12- 8  13:23MR 16:27SS         18:13TE  4: 5MS  5:52TS          7:39SR          1:46VT 
12- 9  13:52MR 16:25SS         18:13TE  5:28MS  5:52TS          7:40SR          0:24VT 
12-10  14:28MR 16:25SS         18:13TE          5:54TS  6:49MS  7:40SR          0: 0VT 
12-11  15:16MR 16:27SS         18:13TE          5:55TS          7:41SR  8: 6MS  0: 0VT 
12-12  16:21MR 16:27SS         18:13TE          5:55TS          7:43SR  9: 7MS  0: 0VT 
12-13          16:27SS 17:37MR 18:13TE          5:55TS          7:43SR  9:55MS  0: 0VT 
12-14          16:27SS         18:13TE 19: 1MR  5:56TS          7:43SR 10:31MS  0:47VT 
12-15          16:27SS         18:15TE 20:23MR  5:56TS          7:45SR 10:58MS  2: 8VT 
12-16          16:28SS         18:15TE 21:43MR  5:58TS          7:46SR 11:19MS  3:28VT 
12-17          16:28SS         18:15TE 22:57MR  5:58TS          7:46SR 11:40MS  4:42VT 
12-18          16:28SS         18:16TE  0: 7MR  5:58TS          7:46SR 11:58MS  5:51VT 
12-19          16:28SS         18:16TE  1:16MR  6: 0TS          7:46SR          7: 0VT 
12-20  12:18MS 16:28SS         18:16TE  2:25MR  6: 0TS          7:48SR          8: 8VT 
12-21  12:38MS 16:30SS         18:16TE  3:32MR  6: 1TS          7:48SR          9:16VT 
12-22  13: 3MS 16:30SS         18:17TE  4:39MR  6: 1TS          7:49SR         10:21VT 
12-23  13:31MS 16:31SS         18:17TE  5:43MR  6: 1TS          7:49SR         11:26VT 
12-24  14: 7MS 16:31SS         18:19TE          6: 1TS  6:43MR  7:49SR         11:42VT 
12-25  14:51MS 16:31SS         18:19TE          6: 1TS  7:35MR  7:49SR         11:42VT 
12-26  15:46MS 16:32SS         18:19TE          6: 3TS          7:49SR  8:19MR 11:43VT 
12-27          16:32SS 16:42MS 18:21TE          6: 3TS          7:49SR  8:56MR 11:41VT 
12-28          16:34SS 17:46MS 18:21TE          6: 3TS          7:49SR  9:25MR 11:41VT 
12-29          16:34SS         18:22TE 18:52MS  6: 3TS          7:50SR  9:48MR 11:10VT 
12-30          16:36SS         18:22TE 19:58MS  6: 4TS          7:50SR 10: 8MR 10: 5VT 
12-31          16:37SS         18:23TE 21: 4MS  6: 4TS          7:50SR 10:28MR  8:59VT 

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.