April 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

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

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.