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The CCAMLR krill synoptic survey
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Times of dawn and dusk
This table shows the times of dawn and dusk. Sunrise and sunset are the
times that the sun rises above or sets below the horizon. Civil dawn and
civil dusk are when the sun rises above and sinks below an angle of 6°
below the horizon. Nautical dawn and dusk are when the sun rises above
and sinks below an angle of 12° below the horizon. For the purposes
of the synoptic survey we have used civil dawn and dusk as the time to
start and stop acoustic transecting. This is a compromise between maximizing
the time for transecting and avoiding the major effects of night-time migration
above the depth of the ship-mounted acoustic transducers. Transects SS1
- SS19 refer to those in Subarea 48.2 & 48.3. Transects AP10 - AP19
refer to those in Subarea 48.1. Transects SSA - SSB refer to those in Subarea
48.4
| Transect |
Waypoint |
Date |
Sunrise |
Sunset |
Civil Dawn |
Civil Dusk |
Nautical Dawn |
Nautical Dusk |
| SS01 |
1 |
20-Jan |
06:19 |
22:13 |
05:40 |
22:52 |
04:31 |
23:58 |
| SS01 |
22 |
22-Jan |
05:55 |
22:30 |
04:58 |
23:24 |
03:26 |
00:58 |
| SS01 |
42 |
24-Jan |
05:20 |
22:52 |
04:08 |
00:06 |
na |
na |
| SS02 |
1 |
16-Jan |
06:20 |
22:27 |
05:35 |
23:11 |
04:31 |
00:17 |
| SS02 |
22 |
18-Jan |
05:57 |
22:46 |
05:02 |
23:46 |
03:17 |
01:33 |
| SS02 |
43 |
19-Jan |
05:16 |
23:17 |
03:54 |
00:40 |
na |
na |
| SS03 |
1 |
14-Jan |
06:24 |
22:37 |
05:38 |
23:22 |
04:32 |
00:29 |
| SS03 |
22 |
15-Jan |
05:56 |
23:01 |
04:58 |
23:57 |
na |
na |
| SS03 |
43 |
17-Jan |
05:19 |
23:32 |
03:52 |
01:01 |
na |
na |
| SS04 |
1 |
24-Jan |
06:48 |
22:33 |
06:05 |
23:16 |
05:06 |
00:17 |
| SS04 |
22 |
26-Jan |
06:27 |
22:52 |
05:35 |
23:43 |
04:12 |
01:09 |
| SS04 |
43 |
27-Jan |
05:56 |
23:19 |
04:46 |
00:32 |
na |
na |
| SS05 |
1 |
20-Jan |
06:46 |
22:44 |
06:02 |
23:27 |
05:00 |
00:31 |
| SS05 |
22 |
21-Jan |
06:22 |
23:07 |
05:28 |
00:03 |
03:50 |
01:40 |
| SS05 |
43 |
23-Jan |
05:51 |
23:36 |
04:35 |
00:55 |
na |
na |
| SS06 |
1 |
18-Jan |
06:49 |
22:53 |
06:05 |
23:37 |
05:01 |
00:42 |
| SS06 |
22 |
19-Jan |
06:25 |
23:17 |
05:29 |
00:14 |
03:44 |
02:00 |
| SS06 |
43 |
21-Jan |
05:54 |
23:49 |
04:34 |
01:11 |
na |
na |
| SS07 |
1 |
28-Jan |
07:17 |
22:50 |
06:36 |
23:31 |
05:39 |
00:30 |
| SS07 |
23 |
30-Jan |
07:00 |
23:10 |
06:10 |
00:03 |
04:52 |
01:20 |
| SS07 |
44 |
31-Jan |
06:35 |
23:38 |
05:29 |
00:48 |
na |
na |
| SS08 |
1 |
24-Jan |
07:05 |
23:15 |
06:17 |
00:04 |
05:06 |
01:15 |
| SS08 |
20 |
25-Jan |
06:44 |
23:40 |
05:45 |
00:41 |
na |
na |
| SS08 |
38 |
27-Jan |
06:21 |
00:12 |
04:59 |
01:34 |
na |
na |
| SS09 |
1 |
22-Jan |
07:09 |
23:27 |
06:20 |
00:17 |
05:05 |
01:32 |
| SS09 |
19 |
23-Jan |
06:49 |
23:53 |
05:49 |
00:55 |
na |
na |
| SS09 |
37 |
24-Jan |
06:23 |
00:30 |
04:55 |
01:57 |
na |
na |
| SS10 |
1 |
01-Feb |
07:22 |
23:35 |
06:30 |
00:29 |
05:07 |
01:51 |
| SS10 |
12 |
02-Feb |
07:13 |
23:49 |
06:14 |
00:50 |
04:17 |
02:47 |
| SS10 |
22 |
03-Feb |
07:03 |
00:07 |
05:55 |
01:15 |
na |
na |
| AP11 |
1 |
30-Jan |
07:28 |
00:01 |
06:33 |
00:56 |
04:56 |
02:33 |
| AP11 |
8 |
30-Jan |
07:13 |
00:04 |
06:13 |
01:04 |
na |
na |
| AP11 |
14 |
31-Jan |
07:12 |
23:54 |
06:12 |
00:56 |
04:07 |
03:01 |
| AP12 |
1 |
25-Jan |
07:20 |
00:22 |
06:19 |
01:23 |
na |
na |
| AP12 |
12 |
25-Jan |
06:54 |
00:30 |
05:41 |
01:43 |
na |
na |
| AP12 |
22 |
26-Jan |
06:31 |
00:35 |
05:03 |
02:04 |
na |
na |
| AP13 |
1 |
04-Feb |
07:50 |
00:09 |
06:55 |
01:04 |
05:23 |
02:36 |
| AP13 |
10 |
04-Feb |
07:32 |
00:13 |
06:30 |
01:14 |
04:07 |
03:37 |
| AP13 |
19 |
05-Feb |
07:14 |
00:14 |
06:05 |
01:23 |
na |
na |
| AP14 |
1 |
31-Jan |
07:47 |
00:31 |
06:48 |
01:30 |
04:49 |
03:29 |
| AP14 |
8 |
01-Feb |
07:35 |
00:33 |
06:31 |
01:37 |
na |
na |
| AP14 |
16 |
01-Feb |
07:19 |
00:38 |
06:06 |
01:51 |
na |
na |
| AP15 |
1 |
27-Jan |
07:47 |
00:50 |
06:44 |
01:53 |
na |
na |
| AP15 |
9 |
27-Jan |
07:28 |
00:58 |
06:16 |
02:10 |
na |
na |
| AP15 |
18 |
28-Jan |
07:09 |
01:05 |
05:44 |
02:30 |
na |
na |
| AP16 |
1 |
06-Feb |
08:20 |
00:32 |
07:26 |
01:27 |
05:56 |
02:56 |
| AP16 |
10 |
06-Feb |
08:03 |
00:38 |
07:02 |
01:39 |
05:08 |
03:33 |
| AP16 |
19 |
07-Feb |
07:49 |
00:41 |
06:40 |
01:50 |
na |
na |
| AP17 |
1 |
02-Feb |
08:23 |
00:56 |
07:25 |
01:53 |
05:40 |
03:38 |
| AP17 |
11 |
03-Feb |
08:06 |
01:02 |
07:01 |
02:08 |
na |
na |
| AP17 |
21 |
04-Feb |
07:48 |
01:09 |
06:31 |
02:25 |
na |
na |
| AP18 |
1 |
29-Jan |
08:18 |
01:11 |
07:17 |
02:12 |
na |
na |
| AP18 |
13 |
30-Jan |
07:55 |
01:22 |
06:42 |
02:36 |
na |
na |
| AP18 |
25 |
31-Jan |
07:29 |
01:36 |
05:51 |
03:13 |
na |
na |
| AP19 |
1 |
08-Feb |
08:54 |
00:55 |
08:01 |
01:48 |
06:37 |
03:12 |
| AP19 |
15 |
09-Feb |
08:33 |
01:03 |
07:30 |
02:07 |
05:03 |
04:33 |
| AP19 |
29 |
10-Feb |
08:06 |
01:15 |
06:47 |
02:35 |
na |
na |
| SSA |
1 |
19 Jan |
05:58 |
21:54 |
05:15 |
22:37 |
04:15 |
23:37 |
| SSA |
21 |
21 Jan |
05:33 |
22:07 |
04:42 |
22:59 |
03:16 |
00:26 |
| SSA |
42 |
23 Jan |
04:59 |
22:26 |
03:50 |
23:34 |
na |
na |
| SSB |
1 |
26 Jan |
06:18 |
21:51 |
05:37 |
22:32 |
04:41 |
23:28 |
| SSB |
21 |
25 Jan |
05:48 |
22:09 |
04:58 |
22:59 |
03:38 |
00:21 |
| SSB |
42 |
23 Jan |
05:05 |
22:36 |
03:54 |
23:46 |
na |
na |
| SSC |
1 |
27 Jan |
06:24 |
21:59 |
05:43 |
22:40 |
04:46 |
23:36 |
| SSC |
21 |
28 Jan |
05:59 |
22:14 |
05:09 |
23:04 |
04:00 |
00:16 |
| SSC |
42 |
30 Jan |
05:32 |
22:30 |
04:28 |
23:32 |
na |
na |
Periods where the sun never goes as far as 12° below the horizon
are shown by 'na' in the table
Page last updated on 15 October 1999