December 1998 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  15:42MR 16:28SS         18:13TE          5:45TS  6: 1MS  7:31SR          0: 0VT 
12- 2  16:22MR 16:28SS         18:13TE          5:46TS  7:16MS  7:31SR          0: 0VT 
12- 3          16:28SS 17:10MR 18:13TE          5:46TS          7:33SR  8:26MS  0: 0VT 
12- 4          16:27SS 18: 4MR 18:13TE          5:48TS          7:34SR  9:27MS  0: 0VT 
12- 5          16:27SS         18:13TE 19: 4MR  5:49TS          7:35SR 10:21MS  0:51VT 
12- 6          16:27SS         18:13TE 20: 8MR  5:49TS          7:37SR 11: 6MS  1:55VT 
12- 7          16:27SS         18:13TE 21:15MR  5:50TS          7:37SR 11:43MS  3: 1VT 
12- 8          16:27SS         18:13TE 22:19MR  5:52TS          7:39SR          4: 6VT 
12- 9  12:15MS 16:25SS         18:13TE 23:22MR  5:52TS          7:40SR          5: 9VT 
12-10  12:43MS 16:25SS         18:13TE  0:24MR  5:52TS          7:40SR          6:10VT 
12-11  13:10MS 16:25SS         18:13TE  1:23MR  5:54TS          7:40SR          7:10VT 
12-12  13:34MS 16:27SS         18:13TE  2:22MR  5:55TS          7:41SR          8: 9VT 
12-13  14: 0MS 16:27SS         18:13TE  3:22MR  5:55TS          7:43SR          9: 8VT 
12-14  14:26MS 16:27SS         18:13TE  4:20MR  5:55TS          7:43SR         10: 7VT 
12-15  14:55MS 16:27SS         18:13TE  5:19MR  5:56TS          7:43SR         11: 6VT 
12-16  15:28MS 16:27SS         18:15TE          5:58TS  6:18MR  7:45SR         11:43VT 
12-17  16: 6MS 16:28SS         18:15TE          5:58TS  7:15MR  7:46SR         11:43VT 
12-18          16:28SS 16:47MS 18:15TE          5:58TS          7:46SR  8: 7MR 11:44VT 
12-19          16:28SS 17:37MS 18:16TE          5:58TS          7:46SR  8:57MR 11:42VT 
12-20          16:28SS         18:16TE 18:31MS  6: 0TS          7:46SR  9:42MR 11:28VT 
12-21          16:28SS         18:16TE 19:31MS  6: 1TS          7:48SR 10:22MR 10:29VT 
12-22          16:30SS         18:16TE 20:34MS  6: 1TS          7:48SR 10:58MR  9:26VT 
12-23          16:30SS         18:17TE 21:40MS  6: 1TS          7:49SR 11:31MR  8:20VT 
12-24          16:31SS         18:17TE 22:49MS  6: 1TS          7:49SR          7:12VT 
12-25  12: 1MR 16:31SS         18:19TE 23:58MS  6: 1TS          7:49SR          6: 3VT 
12-26  12:31MR 16:31SS         18:19TE  1:10MS  6: 1TS          7:49SR          4:50VT 
12-27  13: 3MR 16:32SS         18:19TE  2:22MS  6: 3TS          7:49SR          3:40VT 
12-28  13:36MR 16:34SS         18:21TE  3:37MS  6: 3TS          7:49SR          2:25VT 
12-29  14:13MR 16:34SS         18:22TE  4:50MS  6: 3TS          7:49SR          1:12VT 
12-30  14:56MR 16:34SS         18:22TE          6: 3TS  6: 3MS  7:50SR          0: 0VT 
12-31  15:50MR 16:36SS         18:22TE          6: 4TS  7: 7MS  7:50SR          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.