May 2009 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  12:11MR 20:16SS         22:13TE  2:50MS  4: 0TS          5:55SR          1: 9VT 
 5- 2  13:28MR 20:19SS         22:16TE  3:13MS  3:58TS          5:55SR          0:44VT 
 5- 3  14:43MR 20:19SS         22:17TE  3:34MS  3:55TS          5:54SR          0:20VT 
 5- 4  15:55MR 20:21SS         22:19TE          3:54TS  3:55MS  5:52SR          0: 0VT 
 5- 5  17: 7MR 20:22SS         22:21TE          3:52TS  4:15MS  5:50SR          0: 0VT 
 5- 6  18:17MR 20:23SS         22:22TE          3:49TS  4:37MS  5:49SR          0: 0VT 
 5- 7  19:28MR 20:25SS         22:25TE          3:47TS  5: 4MS  5:48SR          0: 0VT 
 5- 8          20:25SS 20:37MR 22:27TE          3:46TS  5:34MS  5:46SR          0: 0VT 
 5- 9          20:27SS 21:45MR 22:28TE          3:43TS          5:45SR  6:13MS  0: 0VT 
 5-10          20:28SS         22:31TE 22:45MR  3:42TS          5:43SR  6:58MS  0:13VT 
 5-11          20:30SS         22:32TE 23:37MR  3:40TS          5:43SR  7:52MS  1: 4VT 
 5-12          20:31SS         22:34TE  0:21MR  3:37TS          5:41SR  8:52MS  1:46VT 
 5-13          20:31SS         22:36TE  0:55MR  3:35TS          5:40SR  9:55MS  2:19VT 
 5-14          20:32SS         22:37TE  1:23MR  3:34TS          5:39SR 11: 0MS  2:46VT 
 5-15          20:34SS         22:40TE  1:47MR  3:32TS          5:37SR          3: 7VT 
 5-16  12: 4MS 20:36SS         22:42TE  2: 9MR  3:31TS          5:37SR          3:26VT 
 5-17  13:10MS 20:37SS         22:43TE  2:28MR  3:28TS          5:35SR          3:44VT 
 5-18  14:16MS 20:37SS         22:46TE  2:46MR  3:27TS          5:34SR          4: 0VT 
 5-19  15:25MS 20:38SS         22:46TE  3: 5MR  3:25TS          5:34SR          4:19VT 
 5-20  16:38MS 20:40SS         22:49TE          3:24TS  3:28MR  5:33SR          4:34VT 
 5-21  17:52MS 20:40SS         22:51TE          3:22TS  3:54MR  5:31SR          4:30VT 
 5-22  19:10MS 20:42SS         22:52TE          3:20TS  4:28MR  5:31SR          4:28VT 
 5-23  20:30MS 20:43SS         22:55TE          3:19TS  5:10MR  5:30SR          4:23VT 
 5-24          20:43SS 21:45MS 22:55TE          3:17TS          5:30SR  6: 7MR  4:22VT 
 5-25          20:45SS 22:51MS 22:58TE          3:16TS          5:28SR  7:16MR  4:17VT 
 5-26          20:46SS         23: 0TE 23:43MS  3:15TS          5:28SR  8:36MR  3:31VT 
 5-27          20:46SS         23: 1TE  0:22MS  3:13TS          5:26SR  9:57MR  2:50VT 
 5-28          20:47SS         23: 2TE  0:53MS  3:12TS          5:26SR 11:18MR  2:18VT 
 5-29          20:49SS         23: 4TE  1:19MS  3:10TS          5:25SR          1:51VT 
 5-30  12:34MR 20:49SS         23: 6TE  1:40MS  3:10TS          5:25SR          1:30VT 
 5-31  13:46MR 20:51SS         23: 7TE  2: 0MS  3: 7TS          5:25SR          1: 7VT 

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.