February 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

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