December 1999 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  13:55MS 16:28SS         18:13TE  2: 4MR  5:45TS          7:31SR          7:50VT 
12- 2  14:21MS 16:28SS         18:13TE  3: 7MR  5:46TS          7:31SR          8:53VT 
12- 3  14:46MS 16:28SS         18:13TE  4: 9MR  5:46TS          7:33SR          9:55VT 
12- 4  15:11MS 16:27SS         18:13TE  5: 9MR  5:48TS          7:34SR         10:55VT 
12- 5  15:40MS 16:27SS         18:13TE          5:49TS  6:10MR  7:34SR         11:35VT 
12- 6  16:10MS 16:27SS         18:13TE          5:49TS  7: 7MR  7:35SR         11:36VT 
12- 7          16:27SS 16:46MS 18:13TE          5:50TS          7:37SR  8: 4MR 11:37VT 
12- 8          16:27SS 17:25MS 18:13TE          5:50TS          7:37SR  8:56MR 11:37VT 
12- 9          16:25SS 18:10MS 18:13TE          5:52TS          7:39SR  9:45MR 11:38VT 
12-10          16:25SS         18:13TE 19: 1MS  5:52TS          7:40SR 10:28MR 10:51VT 
12-11          16:25SS         18:13TE 19:58MS  5:54TS          7:40SR 11: 6MR  9:55VT 
12-12          16:27SS         18:13TE 20:57MS  5:55TS          7:41SR 11:38MR  8:57VT 
12-13          16:27SS         18:13TE 21:58MS  5:55TS          7:43SR          7:56VT 
12-14  12:10MR 16:27SS         18:13TE 23: 4MS  5:55TS          7:43SR          6:51VT 
12-15  12:37MR 16:27SS         18:13TE  0:10MS  5:56TS          7:43SR          5:47VT 
12-16  13: 4MR 16:27SS         18:15TE  1:19MS  5:58TS          7:45SR          4:39VT 
12-17  13:33MR 16:28SS         18:15TE  2:30MS  5:58TS          7:46SR          3:28VT 
12-18  14: 3MR 16:28SS         18:15TE  3:43MS  5:58TS          7:46SR          2:15VT 
12-19  14:36MR 16:28SS         18:16TE  5: 1MS  5:58TS          7:46SR          0:57VT 
12-20  15:15MR 16:28SS         18:16TE          6: 0TS  6:18MS  7:46SR          0: 0VT 
12-21  16: 1MR 16:28SS         18:16TE          6: 0TS  7:31MS  7:48SR          0: 0VT 
12-22          16:30SS 16:58MR 18:16TE          6: 1TS          7:48SR  8:37MS  0: 0VT 
12-23          16:30SS 18: 2MR 18:17TE          6: 1TS          7:49SR  9:34MS  0: 0VT 
12-24          16:31SS         18:17TE 19:13MR  6: 1TS          7:49SR 10:22MS  0:55VT 
12-25          16:31SS         18:19TE 20:25MR  6: 1TS          7:49SR 11: 0MS  2: 6VT 
12-26          16:31SS         18:19TE 21:37MR  6: 1TS          7:49SR 11:31MS  3:18VT 
12-27          16:32SS         18:19TE 22:46MR  6: 3TS          7:49SR          4:27VT 
12-28  12: 0MS 16:34SS         18:21TE 23:53MR  6: 3TS          7:49SR          5:32VT 
12-29  12:25MS 16:34SS         18:22TE  0:57MR  6: 3TS          7:49SR          6:35VT 
12-30  12:51MS 16:34SS         18:22TE  2: 1MR  6: 3TS          7:49SR          7:38VT 
12-31  13:16MS 16:36SS         18:22TE  3: 1MR  6: 4TS          7:50SR          8:39VT 

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.