December 2010 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  13:40MS 16:28SS         18:13TE  4:10MR  5:45TS          7:31SR          9:56VT 
12- 2  14:11MS 16:28SS         18:13TE  5:25MR  5:46TS          7:31SR         11:12VT 
12- 3  14:49MS 16:27SS         18:13TE          5:46TS  6:39MR  7:34SR         11:33VT 
12- 4  15:37MS 16:27SS         18:13TE          5:48TS          7:34SR  7:45MR 11:34VT 
12- 5  16:25MS 16:27SS         18:13TE          5:49TS          7:35SR  8:41MR 11:35VT 
12- 6          16:27SS 17:27MS 18:13TE          5:49TS          7:37SR  9:27MR 11:36VT 
12- 7          16:27SS         18:13TE 18:31MS  5:50TS          7:37SR 10: 4MR 11:19VT 
12- 8          16:27SS         18:13TE 19:37MS  5:52TS          7:39SR 10:34MR 10:14VT 
12- 9          16:25SS         18:13TE 20:43MS  5:52TS          7:40SR 11: 0MR  9: 9VT 
12-10          16:25SS         18:13TE 21:47MS  5:52TS          7:40SR 11:22MR  8: 5VT 
12-11          16:27SS         18:13TE 22:51MS  5:54TS          7:40SR 11:43MR  7: 2VT 
12-12          16:27SS         18:13TE 23:52MS  5:55TS          7:41SR          6: 2VT 
12-13  12: 1MR 16:27SS         18:13TE  0:54MS  5:55TS          7:43SR          5: 1VT 
12-14  12:22MR 16:27SS         18:13TE  1:57MS  5:55TS          7:43SR          3:58VT 
12-15  12:45MR 16:27SS         18:13TE  3: 0MS  5:56TS          7:45SR          2:56VT 
12-16  13:10MR 16:27SS         18:15TE  4: 5MS  5:58TS          7:45SR          1:52VT 
12-17  13:40MR 16:28SS         18:15TE  5:11MS  5:58TS          7:46SR          0:46VT 
12-18  14:18MR 16:28SS         18:15TE          5:58TS  6:16MS  7:46SR          0: 0VT 
12-19  15: 4MR 16:28SS         18:16TE          6: 0TS  7:16MS  7:46SR          0: 0VT 
12-20  16: 1MR 16:28SS         18:16TE          6: 0TS          7:48SR  8:10MS  0: 0VT 
12-21          16:28SS 17: 8MR 18:16TE          6: 1TS          7:48SR  8:53MS  0: 0VT 
12-22          16:30SS         18:16TE 18:22MR  6: 1TS          7:48SR  9:30MS  0: 5VT 
12-23          16:30SS         18:17TE 19:38MR  6: 1TS          7:49SR 10: 1MS  1:21VT 
12-24          16:31SS         18:17TE 20:55MR  6: 1TS          7:49SR 10:28MS  2:37VT 
12-25          16:31SS         18:19TE 22:13MR  6: 1TS          7:49SR 10:53MS  3:53VT 
12-26          16:31SS         18:19TE 23:28MR  6: 3TS          7:49SR 11:19MS  5: 8VT 
12-27          16:32SS         18:19TE  0:42MR  6: 3TS          7:49SR 11:45MS  6:23VT 
12-28          16:34SS         18:21TE  1:58MR  6: 3TS          7:49SR          7:37VT 
12-29  12:13MS 16:34SS         18:22TE  3:13MR  6: 3TS          7:49SR          8:50VT 
12-30  12:46MS 16:34SS         18:22TE  4:25MR  6: 3TS          7:50SR         10: 3VT 
12-31  13:28MS 16:36SS         18:22TE  5:33MR  6: 4TS          7:50SR         11:10VT 

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.