May 2012 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  15:13MR 20:17SS         22:13TE  3:40MS  3:58TS          5:55SR          0:18VT 
 5- 2  16:30MR 20:19SS         22:16TE          3:57TS  4:10MS  5:55SR          0: 0VT 
 5- 3  17:46MR 20:19SS         22:17TE          3:55TS  4:41MS  5:52SR          0: 0VT 
 5- 4  19: 4MR 20:22SS         22:19TE          3:52TS  5:19MS  5:52SR          0: 0VT 
 5- 5          20:22SS 20:25MR 22:22TE          3:50TS          5:49SR  6: 3MS  0: 0VT 
 5- 6          20:23SS 21:40MR 22:23TE          3:49TS          5:49SR  6:55MS  0: 0VT 
 5- 7          20:25SS         22:25TE 22:47MR  3:46TS          5:48SR  7:58MS  0:22VT 
 5- 8          20:27SS         22:28TE 23:46MR  3:45TS          5:46SR  9: 6MS  1:18VT 
 5- 9          20:28SS         22:28TE  0:33MR  3:43TS          5:45SR 10:16MS  2: 4VT 
 5-10          20:28SS         22:31TE  1:10MR  3:42TS          5:43SR 11:26MS  2:39VT 
 5-11          20:30SS         22:32TE  1:43MR  3:40TS          5:43SR          3:10VT 
 5-12  12:34MS 20:31SS         22:34TE  2:10MR  3:37TS          5:40SR          3:35VT 
 5-13  13:40MS 20:32SS         22:37TE  2:34MR  3:35TS          5:40SR          3:57VT 
 5-14  14:45MS 20:34SS         22:38TE  2:58MR  3:34TS          5:39SR          4:19VT 
 5-15  15:46MS 20:34SS         22:40TE  3:22MR  3:31TS          5:37SR          4:41VT 
 5-16  16:47MS 20:36SS         22:42TE          3:30TS  3:46MR  5:37SR          4:47VT 
 5-17  17:49MS 20:37SS         22:43TE          3:28TS  4:13MR  5:35SR          4:45VT 
 5-18  18:49MS 20:37SS         22:46TE          3:27TS  4:43MR  5:34SR          4:40VT 
 5-19  19:49MS 20:38SS         22:47TE          3:25TS  5:19MR  5:34SR          4:37VT 
 5-20          20:40SS 20:45MS 22:49TE          3:24TS          5:33SR  6: 0MR  4:34VT 
 5-21          20:42SS 21:37MS 22:52TE          3:22TS          5:31SR  6:46MR  4:29VT 
 5-22          20:43SS 22:25MS 22:52TE          3:19TS          5:31SR  7:39MR  4:27VT 
 5-23          20:43SS         22:55TE 23: 8MS  3:19TS          5:30SR  8:37MR  4:10VT 
 5-24          20:45SS         22:57TE 23:46MS  3:16TS          5:28SR  9:38MR  3:30VT 
 5-25          20:46SS         22:58TE  0:18MS  3:16TS          5:28SR 10:43MR  2:58VT 
 5-26          20:46SS         23: 0TE  0:48MS  3:13TS          5:28SR 11:49MR  2:25VT 
 5-27          20:47SS         23: 1TE  1:15MS  3:13TS          5:26SR          1:58VT 
 5-28  12:58MR 20:49SS         23: 2TE  1:42MS  3:12TS          5:25SR          1:30VT 
 5-29  14: 8MR 20:49SS         23: 4TE  2: 9MS  3:10TS          5:25SR          1: 1VT 
 5-30  15:22MR 20:49SS         23: 6TE  2:37MS  3: 9TS          5:25SR          0:31VT 
 5-31  16:38MR 20:51SS         23: 7TE          3: 7TS  3:12MS  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.