December 2007 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  12:48MS 16:28SS         18:13TE  0:34MR  5:45TS          7:31SR          6:20VT 
12- 2  13: 4MS 16:28SS         18:13TE  1:39MR  5:46TS          7:31SR          7:25VT 
12- 3  13:21MS 16:28SS         18:13TE  2:43MR  5:46TS          7:33SR          8:29VT 
12- 4  13:37MS 16:27SS         18:13TE  3:47MR  5:48TS          7:34SR          9:34VT 
12- 5  13:55MS 16:27SS         18:13TE  4:52MR  5:49TS          7:34SR         10:39VT 
12- 6  14:18MS 16:27SS         18:13TE          5:49TS  6: 0MR  7:35SR         11:36VT 
12- 7  14:45MS 16:27SS         18:13TE          5:50TS  7: 4MR  7:37SR         11:37VT 
12- 8  15:19MS 16:27SS         18:13TE          5:52TS          7:37SR  8: 7MR 11:38VT 
12- 9  16: 4MS 16:27SS         18:13TE          5:52TS          7:39SR  9: 0MR 11:38VT 
12-10          16:25SS 16:57MS 18:13TE          5:52TS          7:40SR  9:47MR 11:39VT 
12-11          16:27SS 18: 1MS 18:13TE          5:54TS          7:40SR 10:22MR 11:40VT 
12-12          16:27SS         18:13TE 19: 8MS  5:55TS          7:41SR 10:52MR 10:46VT 
12-13          16:27SS         18:13TE 20:21MS  5:55TS          7:43SR 11:16MR  9:34VT 
12-14          16:27SS         18:13TE 21:32MS  5:55TS          7:43SR 11:37MR  8:22VT 
12-15          16:27SS         18:13TE 22:46MS  5:56TS          7:43SR 11:55MR  7:10VT 
12-16          16:27SS         18:15TE 23:58MS  5:58TS          7:45SR          5:59VT 
12-17  12:15MR 16:28SS         18:15TE  1:15MS  5:58TS          7:46SR          4:43VT 
12-18  12:34MR 16:28SS         18:15TE  2:32MS  5:58TS          7:46SR          3:25VT 
12-19  12:58MR 16:28SS         18:16TE  3:55MS  5:58TS          7:46SR          2: 3VT 
12-20  13:25MR 16:28SS         18:16TE  5:19MS  6: 0TS          7:46SR          0:40VT 
12-21  14: 4MR 16:28SS         18:16TE          6: 0TS  6:41MS  7:48SR          0: 0VT 
12-22  14:53MR 16:30SS         18:16TE          6: 1TS          7:48SR  7:55MS  0: 0VT 
12-23  14:52MR 16:30SS         18:17TE          6: 1TS          7:49SR  8:52MS  0: 0VT 
12-24          16:31SS 17:13MR 18:17TE          6: 1TS          7:49SR  9:36MS  0: 0VT 
12-25          16:31SS         18:19TE 18:34MR  6: 1TS          7:49SR 10: 7MS  0:15VT 
12-26          16:31SS         18:19TE 19:53MR  6: 1TS          7:49SR 10:31MS  1:34VT 
12-27          16:32SS         18:19TE 21: 7MR  6: 3TS          7:49SR 10:52MS  2:47VT 
12-28          16:34SS         18:21TE 22:19MR  6: 3TS          7:49SR 11: 8MS  3:58VT 
12-29          16:34SS         18:22TE 23:25MR  6: 3TS          7:49SR 11:25MS  5: 3VT 
12-30          16:34SS         18:22TE  0:32MR  6: 3TS          7:50SR 11:41MS  6: 9VT 
12-31          16:36SS         18:22TE  1:37MR  6: 4TS          7:50SR          7:14VT 

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.