January 2011 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  14:16MS 16:37SS         18:23TE          6: 4TS  6:31MR  7:50SR         11:40VT 
 1- 2  15:13MS 16:37SS         18:25TE          6: 4TS  7:22MR  7:50SR         11:38VT 
 1- 3  16:16MS 16:38SS         18:25TE          6: 4TS          7:49SR  8: 2MR 11:38VT 
 1- 4          16:40SS 17:22MS 18:27TE          6: 4TS          7:49SR  8:34MR 11:37VT 
 1- 5          16:40SS         18:28TE 18:28MS  6: 4TS          7:49SR  9: 2MR 11:35VT 
 1- 6          16:42SS         18:28TE 19:32MS  6: 4TS          7:49SR  9:26MR 10:31VT 
 1- 7          16:43SS         18:30TE 20:37MS  6: 3TS          7:49SR  9:47MR  9:25VT 
 1- 8          16:43SS         18:31TE 21:38MS  6: 3TS          7:49SR 10: 7MR  8:24VT 
 1- 9          16:46SS         18:31TE 22:40MS  6: 3TS          7:49SR 10:25MR  7:22VT 
 1-10          16:46SS         18:32TE 23:42MS  6: 3TS          7:49SR 10:46MR  6:20VT 
 1-11          16:47SS         18:34TE  0:45MS  6: 3TS          7:48SR 11:10MR  5:18VT 
 1-12          16:49SS         18:34TE  1:49MS  6: 1TS          7:48SR 11:37MR  4:12VT 
 1-13          16:49SS         18:36TE  2:54MS  6: 1TS          7:46SR          3: 7VT 
 1-14  12:11MR 16:52SS         18:37TE  3:58MS  6: 1TS          7:46SR          2: 2VT 
 1-15  12:52MR 16:52SS         18:37TE  5: 0MS  6: 1TS          7:46SR          1: 1VT 
 1-16  13:45MR 16:53SS         18:38TE  5:56MS  6: 1TS          7:46SR          0: 4VT 
 1-17  14:46MR 16:55SS         18:40TE          6: 0TS  6:46MS  7:45SR          0: 0VT 
 1-18  16: 1MR 16:57SS         18:42TE          5:58TS  7:26MS  7:43SR          0: 0VT 
 1-19          16:58SS 17:16MR 18:43TE          5:58TS          7:43SR  8: 0MS  0: 0VT 
 1-20          17: 0SS 18:34MR 18:43TE          5:58TS          7:43SR  8:30MS  0: 0VT 
 1-21          17: 1SS         18:45TE 19:55MR  5:58TS          7:41SR  8:56MS  1:10VT 
 1-22          17: 1SS         18:46TE 21:13MR  5:56TS          7:40SR  9:22MS  2:26VT 
 1-23          17: 4SS         18:47TE 22:31MR  5:55TS          7:40SR  9:48MS  3:43VT 
 1-24          17: 4SS         18:49TE 23:47MR  5:55TS          7:39SR 10:18MS  4:58VT 
 1-25          17: 7SS         18:49TE  1: 2MR  5:54TS          7:37SR 10:49MS  6:13VT 
 1-26          17: 7SS         18:52TE  2:16MR  5:54TS          7:37SR 11:28MS  7:24VT 
 1-27          17: 8SS         18:52TE  3:25MR  5:52TS          7:35SR          8:32VT 
 1-28  12:13MS 17:10SS         18:53TE  4:25MR  5:52TS          7:34SR          9:31VT 
 1-29  13: 6MS 17:12SS         18:55TE  5:18MR  5:50TS          7:34SR         10:22VT 
 1-30  14: 6MS 17:13SS         18:57TE          5:49TS  6: 1MR  7:33SR         10:52VT 
 1-31  15:10MS 17:15SS         18:58TE          5:49TS  6:35MR  7:31SR         10:50VT 

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.