September 2001 Dark Sky Observing Time

The dark sky table shows the Pacific Daylight Saving Time (PDT) 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

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

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.