January 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

 1- 1          16:37SS 18: 7MR 18:23TE          6: 4TS          7:50SR  9:15MS  0: 0VT 
 1- 2          16:37SS         18:25TE 19:31MR  6: 4TS          7:50SR  9:44MS  1: 6VT 
 1- 3          16:38SS         18:25TE 20:52MR  6: 4TS          7:49SR 10: 7MS  2:26VT 
 1- 4          16:40SS         18:27TE 22:10MR  6: 4TS          7:49SR 10:31MS  3:43VT 
 1- 5          16:40SS         18:28TE 23:27MR  6: 4TS          7:49SR 10:53MS  4:58VT 
 1- 6          16:42SS         18:28TE  0:40MR  6: 4TS          7:49SR 11:16MS  6:12VT 
 1- 7          16:43SS         18:30TE  1:52MR  6: 3TS          7:49SR 11:43MS  7:22VT 
 1- 8          16:45SS         18:31TE  3: 4MR  6: 3TS          7:49SR          8:32VT 
 1- 9  12:15MS 16:46SS         18:31TE  4:11MR  6: 3TS          7:49SR          9:40VT 
 1-10  12:52MS 16:46SS         18:32TE  5:13MR  6: 3TS          7:49SR         10:41VT 
 1-11  13:37MS 16:47SS         18:34TE          6: 1TS  6: 7MR  7:48SR         11:27VT 
 1-12  14:30MS 16:49SS         18:34TE          6: 1TS  6:54MR  7:48SR         11:27VT 
 1-13  15:30MS 16:51SS         18:36TE          6: 1TS  7:31MR  7:46SR         11:25VT 
 1-14  16:31MS 16:52SS         18:37TE          6: 1TS          7:46SR  8: 0MR 11:23VT 
 1-15          16:52SS 17:34MS 18:38TE          6: 1TS          7:46SR  8:26MR 11:22VT 
 1-16          16:55SS         18:40TE 18:40MS  6: 0TS          7:45SR  8:48MR 11:19VT 
 1-17          16:55SS         18:40TE 19:43MS  6: 0TS          7:45SR  9: 7MR 10:16VT 
 1-18          16:57SS         18:42TE 20:45MS  5:58TS          7:43SR  9:26MR  9:14VT 
 1-19          16:58SS         18:43TE 21:47MS  5:58TS          7:43SR  9:44MR  8:11VT 
 1-20          17: 0SS         18:43TE 22:52MS  5:58TS          7:41SR 10: 4MR  7: 5VT 
 1-21          17: 1SS         18:46TE 23:58MS  5:56TS          7:41SR 10:25MR  5:58VT 
 1-22          17: 2SS         18:46TE  1: 6MS  5:56TS          7:40SR 10:52MR  4:50VT 
 1-23          17: 4SS         18:47TE  2:16MS  5:55TS          7:40SR 11:25MR  3:38VT 
 1-24          17: 4SS         18:49TE  3:28MS  5:55TS          7:39SR          2:27VT 
 1-25  12: 8MR 17: 7SS         18:51TE  4:35MS  5:54TS          7:37SR          1:18VT 
 1-26  13: 4MR 17: 7SS         18:52TE  5:37MS  5:52TS          7:37SR          0:15VT 
 1-27  14:13MR 17:10SS         18:52TE          5:52TS  6:26MS  7:35SR          0: 0VT 
 1-28  15:35MR 17:10SS         18:53TE          5:52TS  7: 7MS  7:34SR          0: 0VT 
 1-29  16:58MR 17:13SS         18:55TE          5:50TS          7:34SR  7:40MS  0: 0VT 
 1-30          17:13SS 18:22MR 18:57TE          5:49TS          7:31SR  8: 7MS  0: 0VT 
 1-31          17:16SS         18:58TE 19:45MR  5:49TS          7:31SR  8:33MS  0:46VT 

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.