January 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

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

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.