| DERBYSHIRE SUNDIALS | ||||||||||||
| THE EQUATION OF TIME | ||||||||||||
| The Equation of Time is the variation in time shown by our clocks, and that shown on our sundials.
A sundial can be up to 16 minutes and 23 second fast, and 14 minutes 20 seconds slow. The table shows the variation for each day of the year. | ||||||||||||
| Day | Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| --- | slow | slow | slow | slow | fast | fast | slow | slow | slow | fast | fast | fast |
| 1 | 3m12s | 13m33s | 12m34s | 4m08s | 2m51s | 2m25s | 3m33s | 6m16s | 0m12s | 10m05s | 16m20s | 11m11s |
| 2 | 3:40 | 13:41 | 12:23 | 3:50 | 2:59 | 2:16 | 3:45 | 6:13 | 0:07 | 10:24 | 16:22 | 10:49 |
| 3 | 4:08 | 13:48 | 12:11 | 3:32 | 3:06 | 2:06 | 3:57 | 6:09 | 0:26 | 10:43 | 16:23 | 10:26 |
| 4 | 4:36 | 13:55 | 11:58 | 3:14 | 3:12 | 1:56 | 4:08 | 6:04 | 0:45 | 11:02 | 16:23 | 10:02 |
| 5 | 5:03 | 14:01 | 11:45 | 2:57 | 3:18 | 1:46 | 4:19 | 5:59 | 1:05 | 11:20 | 16:22 | 9:38 |
| --- | slow | slow | slow | slow | fast | fast | slow | slow | fast | fast | fast | fast |
| 6 | 5:30 | 14:06 | 11:31 | 2:40 | 3:23 | 1:36 | 4:29 | 5:53 | 1:25 | 11:38 | 16:20 | 9:13 |
| 7 | 5:57 | 14:10 | 11:17 | 2:23 | 3:27 | 1:25 | 4:39 | 5:46 | 1:45 | 11:56 | 16:18 | 8:48 |
| 8 | 6:23 | 14:14 | 11:03 | 2:06 | 3:31 | 1:14 | 4:49 | 5:39 | 2:05 | 12:13 | 16:15 | 8:22 |
| 9 | 6:49 | 14:16 | 10:48 | 1:49 | 3:35 | 1:03 | 4:58 | 5:31 | 2:26 | 12:30 | 16:11 | 7:56 |
| 10 | 7:14 | 14:18 | 10:33 | 1:32 | 3:38 | 0:51 | 5:07 | 5:23 | 2:47 | 12:46 | 16:06 | 7:29 |
| Day | Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| --- | slow | slow | slow | slow | fast | fast | slow | slow | fast | fast | fast | fast |
| 11 | 7:38 | 4:19 | 10:18 | 1:16 | 3:40 | 0:39 | 5:16 | 5:14 | 3:08 | 13:02 | 16:00 | 7:02 |
| 12 | 8:02 | 14:20 | 10:02 | 1:00 | 3:42 | 0:27 | 5:24 | 5:05 | 3:29 | 13:18 | 15:53 | 6:34 |
| 13 | 8:25 | 14:19 | 9:46 | 0:44 | 3:44 | 0:15 | 5:32 | 4:55 | 3:50 | 13:33 | 15:46 | 6:06 |
| 14 | 8:48 | 14:18 | 9:30 | 0:29 | 3:44 | 0:03 | 5:39 | 4:44 | 4:11 | 13:47 | 15:37 | 5:38 |
| 15 | 9:10 | 14:16 | 9:13 | 0:14 | 3:44 | 0:10 | 5:46 | 4:33 | 4:32 | 14:01 | 15:28 | 5:09 |
| --- | slow | slow | slow | fast | fast | slow | slow | slow | fast | fast | fast | fast |
| 16 | 9:32 | 14:13 | 8:56 | 0:01 | 3:44 | 0:23 | 5:52 | 4:21 | 4:53 | 14:14 | 15:18 | 4:40 |
| 17 | 9:52 | 14:10 | 8:39 | 0:15 | 3:43 | 0:36 | 5:58 | 4:09 | 5:14 | 14:27 | 15:07 | 4:11 |
| 18 | 10:12 | 14:06 | 8:22 | 0:29 | 3:41 | 0:49 | 6:03 | 3:57 | 5:35 | 14:39 | 14:56 | 3:42 |
| 19 | 10:32 | 14:01 | 8:04 | 0:43 | 3:39 | 1:02 | 6:08 | 3:44 | 5:56 | 14:51 | 14:43 | 3:13 |
| 20 | 10:50 | 13:55 | 7:46 | 0:56 | 3:37 | 1:15 | 6:12 | 3:30 | 6:18 | 15:02 | 14:30 | 2:43 |
| Day | Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| --- | slow | slow | slow | fast | fast | slow | slow | slow | fast | fast | fast | fast |
| 21 | 11:08 | 13:49 | 7:28 | 1:00 | 3:34 | 1:28 | 6:15 | 3:16 | 6:40 | 15:12 | 14:16 | 2:13 |
| 22 | 11:25 | 13:42 | 7:10 | 1:21 | 3:30 | 1:41 | 6:18 | 3:01 | 7:01 | 15:22 | 14:01 | 1:43 |
| 23 | 11:41 | 13:35 | 6:52 | 1:33 | 3:24 | 1:54 | 6:20 | 2:46 | 7:22 | 15:31 | 13:45 | 1:13 |
| 24 | 11:57 | 13:27 | 6:34 | 1:45 | 3:21 | 2:07 | 6:22 | 2:30 | 7:43 | 15:40 | 13:28 | 0:43 |
| 25 | 12:12 | 13:18 | 6:16 | 1:56 | 3:16 | 2:20 | 6:24 | 2:14 | 8:04 | 15:47 | 13:11 | 0:13 |
| --- | slow | slow | slow | fast | fast | slow | slow | slow | fast | fast | fast | slow |
| 26 | 12:26 | 13:09 | 5:58 | 2:06 | 3:10 | 2:33 | 6:25 | 1:58 | 8:25 | 15:54 | 12:53 | 0:17 |
| 27 | 12:39 | 12:59 | 5:40 | 2:16 | 3:03 | 2:45 | 6:25 | 1:41 | 8:46 | 16:01 | 12:34 | 0:47 |
| 28 | 12:51 | 12:48 | 5:21 | 2:26 | 2:56 | 2:57 | 6:24 | 1:24 | 9:06 | 16:06 | 12:14 | 1:16 |
| 29 | 13:03 | 12:42 | 5:02 | 2:35 | 2:49 | 3:09 | 6:23 | 1:07 | 9:26 | 16:11 | 11:54 | 1:45 |
| 30 | 13:14 | ---- | 4:44 | 2:43 | 2:41 | 3:21 | 6:21 | 0:49 | 9:46 | 16:15 | 11:33 | 2:14 |
| 31 | 13:24 | ---- | 4:26 | ---- | 2:33 | ---- | 6:19 | 0:31 | ---- | 16:18 | ---- | 2:43 |