May 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

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