December 2012 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 19:27MR  5:46TS          7:31SR 10:21MS  1:13VT 
12- 2          16:28SS         18:13TE 20:27MR  5:46TS          7:33SR 10:52MS  2:13VT 
12- 3          16:27SS         18:13TE 21:28MR  5:48TS          7:34SR 11:21MS  3:15VT 
12- 4          16:27SS         18:13TE 22:32MR  5:49TS          7:34SR 11:48MS  4:19VT 
12- 5          16:27SS         18:13TE 23:37MR  5:49TS          7:35SR          5:24VT 
12- 6  12:13MS 16:27SS         18:13TE  0:46MR  5:49TS          7:37SR          6:32VT 
12- 7  12:40MS 16:27SS         18:13TE  1:55MR  5:50TS          7:37SR          7:42VT 
12- 8  13:10MS 16:27SS         18:13TE  3: 9MR  5:52TS          7:39SR          8:55VT 
12- 9  13:45MS 16:25SS         18:13TE  4:24MR  5:52TS          7:40SR         10:10VT 
12-10  14:25MS 16:27SS         18:13TE  5:40MR  5:54TS          7:40SR         11:26VT 
12-11  15:13MS 16:27SS         18:13TE          5:55TS  6:50MR  7:41SR         11:41VT 
12-12  16:10MS 16:27SS         18:13TE          5:55TS          7:43SR  7:55MR 11:41VT 
12-13          16:27SS 17:17MS 18:13TE          5:55TS          7:43SR  8:49MR 11:42VT 
12-14          16:27SS         18:13TE 18:31MS  5:56TS          7:43SR  9:34MR 11:25VT 
12-15          16:27SS         18:15TE 19:46MS  5:56TS          7:45SR 10:11MR 10:10VT 
12-16          16:28SS         18:15TE 21: 0MS  5:58TS          7:46SR 10:43MR  8:58VT 
12-17          16:28SS         18:15TE 22:10MS  5:58TS          7:46SR 11:11MR  7:48VT 
12-18          16:28SS         18:16TE 23:19MS  5:58TS          7:46SR 11:37MR  6:39VT 
12-19          16:28SS         18:16TE  0:24MS  6: 0TS          7:46SR          5:35VT 
12-20  12: 4MR 16:28SS         18:16TE  1:27MS  6: 0TS          7:48SR          4:33VT 
12-21  12:31MR 16:30SS         18:16TE  2:28MS  6: 1TS          7:48SR          3:32VT 
12-22  12:58MR 16:30SS         18:17TE  3:30MS  6: 1TS          7:49SR          2:31VT 
12-23  13:30MR 16:31SS         18:17TE  4:28MS  6: 1TS          7:49SR          1:33VT 
12-24  14: 6MR 16:31SS         18:19TE  5:24MS  6: 1TS          7:49SR          0:37VT 
12-25  14:46MR 16:31SS         18:19TE          6: 1TS  6:16MS  7:49SR          0: 0VT 
12-26  15:31MR 16:32SS         18:19TE          6: 3TS  7: 4MS  7:49SR          0: 0VT 
12-27  16:23MR 16:32SS         18:21TE          6: 3TS  7:46MS  7:49SR          0: 0VT 
12-28          16:34SS 17:19MR 18:22TE          6: 3TS          7:49SR  8:22MS  0: 0VT 
12-29          16:34SS 18:19MR 18:22TE          6: 3TS          7:50SR  8:56MS  0: 0VT 
12-30          16:36SS         18:22TE 19:22MR  6: 4TS          7:50SR  9:25MS  0:59VT 
12-31          16:37SS         18:23TE 20:25MR  6: 4TS          7:50SR  9:52MS  2: 1VT 

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.