January 2004 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  12:55MR 16:37SS         18:23TE  3:22MS  6: 4TS          7:50SR          2:42VT 
 1- 2  13:16MR 16:37SS         18:25TE  4:28MS  6: 4TS          7:50SR          1:35VT 
 1- 3  13:41MR 16:38SS         18:25TE  5:31MS  6: 4TS          7:50SR          0:32VT 
 1- 4  14:13MR 16:40SS         18:27TE          6: 4TS  6:34MS  7:49SR          0: 0VT 
 1- 5  14:52MR 16:40SS         18:28TE          6: 4TS  7:33MS  7:49SR          0: 0VT 
 1- 6  15:45MR 16:42SS         18:28TE          6: 4TS          7:49SR  8:22MS  0: 0VT 
 1- 7  16:37MR 16:43SS         18:28TE          6: 4TS          7:49SR  9: 3MS  0: 0VT 
 1- 8          16:43SS 17:43MR 18:30TE          6: 3TS          7:49SR  9:37MS  0: 0VT 
 1- 9          16:45SS         18:31TE 18:52MR  6: 3TS          7:49SR 10: 6MS  0:21VT 
 1-10          16:46SS         18:31TE 20: 2MR  6: 3TS          7:49SR 10:28MS  1:31VT 
 1-11          16:47SS         18:34TE 21:13MR  6: 3TS          7:48SR 10:49MS  2:39VT 
 1-12          16:49SS         18:34TE 22:25MR  6: 1TS          7:48SR 11: 8MS  3:50VT 
 1-13          16:49SS         18:36TE 23:37MR  6: 1TS          7:46SR 11:28MS  5: 1VT 
 1-14          16:51SS         18:37TE  0:52MR  6: 1TS          7:46SR 11:49MS  6:14VT 
 1-15          16:52SS         18:37TE  2:10MR  6: 1TS          7:46SR          7:32VT 
 1-16  12:15MS 16:53SS         18:38TE  3:30MR  6: 1TS          7:46SR          8:51VT 
 1-17  12:46MS 16:55SS         18:40TE  4:52MR  6: 0TS          7:45SR         10:11VT 
 1-18  13:26MS 16:55SS         18:40TE          6: 0TS  6:10MR  7:43SR         11:19VT 
 1-19  14:21MS 16:58SS         18:43TE          5:58TS  7:16MR  7:43SR         11:15VT 
 1-20  15:33MS 16:58SS         18:43TE          5:58TS          7:43SR  8:10MR 11:14VT 
 1-21  16:46MS 17: 0SS         18:45TE          5:58TS          7:41SR  8:49MR 11:13VT 
 1-22          17: 1SS 18: 7MS 18:46TE          5:56TS          7:40SR  9:21MR 11:10VT 
 1-23          17: 2SS         18:46TE 19:25MS  5:55TS          7:40SR  9:45MR 10:30VT 
 1-24          17: 4SS         18:49TE 20:40MS  5:55TS          7:39SR 10: 4MR  9:15VT 
 1-25          17: 6SS         18:49TE 21:49MS  5:55TS          7:37SR 10:22MR  8: 5VT 
 1-26          17: 7SS         18:51TE 22:58MS  5:54TS          7:37SR 10:40MR  6:55VT 
 1-27          17: 8SS         18:52TE  0: 5MS  5:52TS          7:35SR 10:58MR  5:47VT 
 1-28          17:10SS         18:53TE  1:10MS  5:52TS          7:34SR 11:19MR  4:41VT 
 1-29          17:12SS         18:55TE  2:16MS  5:50TS          7:34SR 11:43MR  3:34VT 
 1-30          17:13SS         18:55TE  3:20MS  5:49TS          7:33SR          2:28VT 
 1-31  12:11MR 17:15SS         18:58TE  4:25MS  5:49TS          7:31SR          1:24VT 

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.