May 2011 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  19:12MS 20:16SS         22:13TE          4: 1TS  5:19MR  5:56SR          5:47VT 
 5- 2  20:15MS 20:17SS         22:15TE          3:58TS  5:49MR  5:55SR          5:43VT 
 5- 3          20:19SS 21:16MS 22:16TE          3:57TS          5:54SR  6:26MR  5:40VT 
 5- 4          20:21SS 22:16MS 22:19TE          3:55TS          5:52SR  7:11MR  5:35VT 
 5- 5          20:22SS         22:19TE 23:13MS  3:52TS          5:50SR  8: 3MR  4:39VT 
 5- 6          20:22SS         22:22TE  0: 2MS  3:50TS          5:49SR  9: 4MR  3:48VT 
 5- 7          20:23SS         22:23TE  0:43MS  3:49TS          5:49SR 10:10MR  3: 5VT 
 5- 8          20:25SS         22:25TE  1:19MS  3:46TS          5:46SR 11:22MR  2:27VT 
 5- 9          20:27SS         22:28TE  1:51MS  3:45TS          5:46SR          1:54VT 
 5-10  12:34MR 20:28SS         22:30TE  2:19MS  3:43TS          5:45SR          1:23VT 
 5-11  13:49MR 20:28SS         22:31TE  2:45MS  3:40TS          5:43SR          0:55VT 
 5-12  15: 4MR 20:30SS         22:34TE  3:12MS  3:39TS          5:41SR          0:27VT 
 5-13  16:22MR 20:31SS         22:36TE          3:37TS  3:39MS  5:40SR          0: 0VT 
 5-14  17:40MR 20:32SS         22:37TE          3:34TS  4:10MS  5:40SR          0: 0VT 
 5-15  19: 0MR 20:34SS         22:38TE          3:34TS  4:46MS  5:39SR          0: 0VT 
 5-16  20:17MR 20:34SS         22:40TE          3:31TS  5:31MS  5:37SR          0: 0VT 
 5-17          20:36SS 21:30MR 22:43TE          3:30TS          5:37SR  6:24MS  0: 0VT 
 5-18          20:37SS 22:32MR 22:45TE          3:28TS          5:35SR  7:25MS  0: 0VT 
 5-19          20:38SS         22:46TE 23:23MR  3:27TS          5:34SR  8:30MS  0:37VT 
 5-20          20:40SS         22:47TE  0: 6MR  3:25TS          5:34SR  9:37MS  1:18VT 
 5-21          20:40SS         22:49TE  0:39MR  3:22TS          5:33SR 10:46MS  1:49VT 
 5-22          20:42SS         22:52TE  1: 7MR  3:22TS          5:31SR 11:51MS  2:14VT 
 5-23          20:43SS         22:53TE  1:31MR  3:19TS          5:31SR          2:37VT 
 5-24  12:55MS 20:43SS         22:55TE  1:52MR  3:17TS          5:30SR          2:56VT 
 5-25  13:56MS 20:45SS         22:57TE  2:13MR  3:16TS          5:28SR          3:15VT 
 5-26  14:58MS 20:46SS         22:58TE  2:34MR  3:16TS          5:28SR          3:35VT 
 5-27  15:58MS 20:46SS         23: 1TE  2:57MR  3:13TS          5:28SR          3:55VT 
 5-28  17: 1MS 20:47SS         23: 1TE          3:13TS  3:22MR  5:26SR          4:11VT 
 5-29  18: 4MS 20:49SS         23: 4TE          3:10TS  3:50MR  5:25SR          4: 6VT 
 5-30  19: 7MS 20:49SS         23: 4TE          3:10TS  4:25MR  5:25SR          4: 5VT 
 5-31  20: 8MS 20:51SS         23: 7TE          3: 9TS  5: 7MR  5:25SR          4: 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.