May 2010 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          20:16SS         22:13TE  0:16MR  4: 1TS          5:56SR  8:52MS  2: 3VT 
 5- 2          20:17SS         22:15TE  1: 0MR  3:58TS          5:55SR  9:53MS  2:45VT 
 5- 3          20:19SS         22:16TE  1:34MR  3:55TS          5:54SR 10:58MS  3:17VT 
 5- 4          20:21SS         22:19TE  2: 1MR  3:54TS          5:52SR          3:42VT 
 5- 5  12: 3MS 20:22SS         22:21TE  2:25MR  3:52TS          5:50SR          4: 4VT 
 5- 6  13: 6MS 20:22SS         22:22TE  2:46MR  3:49TS          5:49SR          4:24VT 
 5- 7  14: 7MS 20:25SS         22:25TE  3: 5MR  3:47TS          5:48SR          4:40VT 
 5- 8  15:10MS 20:25SS         22:27TE  3:25MR  3:46TS          5:46SR          4:58VT 
 5- 9  16:15MS 20:27SS         22:28TE          3:43TS  3:46MR  5:46SR          5:15VT 
 5-10  17:19MS 20:28SS         22:30TE          3:42TS  4: 7MR  5:43SR          5:11VT 
 5-11  18:28MS 20:30SS         22:31TE          3:40TS  4:33MR  5:43SR          5: 9VT 
 5-12  19:37MS 20:31SS         22:34TE          3:39TS  5: 4MR  5:41SR          5: 4VT 
 5-13          20:31SS 20:49MS 22:36TE          3:37TS          5:40SR  5:43MR  5: 0VT 
 5-14          20:32SS 21:55MS 22:37TE          3:34TS          5:40SR  6:34MR  4:57VT 
 5-15          20:34SS         22:40TE 22:58MS  3:32TS          5:37SR  7:34MR  4:34VT 
 5-16          20:34SS         22:42TE 23:49MS  3:31TS          5:37SR  8:45MR  3:41VT 
 5-17          20:37SS         22:43TE  0:32MS  3:30TS          5:35SR 10: 0MR  2:58VT 
 5-18          20:37SS         22:45TE  1: 6MS  3:28TS          5:34SR 11:16MR  2:22VT 
 5-19          20:38SS         22:46TE  1:34MS  3:25TS          5:34SR          1:50VT 
 5-20  12:34MR 20:40SS         22:49TE  2: 0MS  3:24TS          5:33SR          1:24VT 
 5-21  13:49MR 20:40SS         22:51TE  2:24MS  3:22TS          5:31SR          0:58VT 
 5-22  15: 6MR 20:42SS         22:52TE  2:46MS  3:20TS          5:31SR          0:34VT 
 5-23  16:21MR 20:43SS         22:53TE  3:12MS  3:19TS          5:31SR          0: 7VT 
 5-24  17:36MR 20:43SS         22:55TE          3:17TS  3:40MS  5:30SR          0: 0VT 
 5-25  18:51MR 20:45SS         22:58TE          3:16TS  4:13MS  5:28SR          0: 0VT 
 5-26  20: 2MR 20:46SS         22:58TE          3:15TS  4:54MS  5:28SR          0: 0VT 
 5-27          20:46SS 21: 8MR 23: 1TE          3:13TS          5:26SR  5:41MS  0: 0VT 
 5-28          20:47SS 22: 6MR 23: 2TE          3:12TS          5:26SR  6:37MS  0: 0VT 
 5-29          20:49SS 22:53MR 23: 4TE          3:10TS          5:25SR  7:40MS  0: 0VT 
 5-30          20:49SS         23: 6TE 23:31MR  3:10TS          5:25SR  8:44MS  0:25VT 
 5-31          20:51SS         23: 7TE  0: 3MR  3: 9TS          5:25SR  9:48MS  0:55VT 

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.