December 2001 Dark Sky Observing Time

The dark sky table shows the Pacific Standard Time (PST) 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

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