Yea! The winter solstice is over and the days will be ...

Yea! The winter solstice is over and the days will be getting longer

Days are going to start getting longer now. We've passed the darkest day, December 21st, the winter solstice. Have you noticed a difference yet?

I wonder if the change in daylight length will be noticeable. How fast do the hours of daylight change? Will each day be about a minute longer? Two minutes longer? Five minutes?

1. What's your guess?

2. What else do you wonder?

I've looked up the sunset and sunrise times for where I live to see how different the daylight hours are on the shortest day and the longest day.

Date

Sunrise Sunset Length of daylight

December 21, 2018 7:12 am 4:16 pm

June 21, 2018

5:09 am 8:26 pm

3. Fill in the last column of this table with the actual lengths of daylight on these two days.

4. What's the difference in daylight hours between the longest day and the shortest days of the year?

5. Using this information, on average, how much more daylight should we expect each day through June 21st?

6. Do you think the increase in daylight hours will be about the same every day = linear progression? Please explain.

7. I've looked up the daylight hours for where I live near Boston, MA, and created the chart below for just January and February. Either look up your own chart at the following website or use my Boston times to see what you can observe.

Date

Jan 1, 2018 Jan 2, 2018 Jan 3, 2018 Jan 4, 2018 Jan 5, 2018 Jan 6, 2018 Jan 7, 2018 Jan 8, 2018 Jan 9, 2018 Jan 10, 2018 Jan 11, 2018 Jan 12, 2018 Jan 13, 2018 Jan 14, 2018 Jan 15, 2018 Jan 16, 2018 Jan 17, 2018

Sunrise

7:14 AM 7:14 AM 7:14 AM 7:14 AM 7:13 AM 7:13 AM 7:13 AM 7:13 AM 7:13 AM 7:13 AM 7:12 AM 7:12 AM 7:12 AM 7:11 AM 7:11 AM 7:10 AM 7:10 AM

Sunset

4:23 PM 4:24 PM 4:24 PM 4:25 PM 4:26 PM 4:27 PM 4:28 PM 4:29 PM 4:30 PM 4:32 PM 4:33 PM 4:34 PM 4:35 PM 4:36 PM 4:37 PM 4:38 PM 4:40 PM

This day

9:09:07 9:09:57 9:10:51 9:11:49 9:12:51 9:13:57 9:15:06 9:16:20 9:17:37 9:18:58 9:20:22 9:21:49 9:23:20 9:24:55 9:26:32 9:28:13 9:29:57

Length of day Time difference between this day and the previous day +0:45 +0:50 +0:54 +0:58 +1:01 +1:05 +1:09 +1:13 +1:17 +1:20 +1:24 +1:27 +1:31 +1:34 +1:37 +1:40 +1:43

Jan 18, 2018 Jan 19, 2018 Jan 20, 2018 Jan 21, 2018 Jan 22, 2018 Jan 23, 2018 Jan 24, 2018 Jan 25, 2018 Jan 26, 2018 Jan 27, 2018 Jan 28, 2018 Jan 29, 2018 Jan 30, 2018 Jan 31, 2018 Feb 1, 2018 Feb 2, 2018 Feb 3, 2018 Feb 4, 2018 Feb 5, 2018 Feb 6, 2018 Feb 7, 2018 Feb 8, 2018 Feb 9, 2018 Feb 10, 2018 Feb 11, 2018 Feb 12, 2018 Feb 13, 2018 Feb 14, 2018 Feb 15, 2018 Feb 16, 2018 Feb 17, 2018 Feb 18, 2018 Feb 19, 2018 Feb 20, 2018 Feb 21, 2018 Feb 22, 2018 Feb 23, 2018 Feb 24, 2018 Feb 25, 2018 Feb 26, 2018 Feb 27, 2018 Feb 28, 2018

7:09 AM 7:08 AM 7:08 AM 7:07 AM 7:06 AM 7:06 AM 7:05 AM 7:04 AM 7:03 AM 7:02 AM 7:01 AM 7:01 AM 7:00 AM 6:59 AM 6:58 AM 6:56 AM 6:55 AM 6:54 AM 6:53 AM 6:52 AM 6:51 AM 6:50 AM 6:48 AM 6:47 AM 6:46 AM 6:44 AM 6:43 AM 6:42 AM 6:40 AM 6:39 AM 6:38 AM 6:36 AM 6:35 AM 6:33 AM 6:32 AM 6:30 AM 6:29 AM 6:27 AM 6:26 AM 6:24 AM 6:22 AM 6:21 AM

4:41 PM 4:42 PM 4:43 PM 4:45 PM 4:46 PM 4:47 PM 4:48 PM 4:50 PM 4:51 PM 4:52 PM 4:53 PM 4:55 PM 4:56 PM 4:57 PM 4:59 PM 5:00 PM 5:01 PM 5:03 PM 5:04 PM 5:05 PM 5:07 PM 5:08 PM 5:09 PM 5:10 PM 5:12 PM 5:13 PM 5:14 PM 5:16 PM 5:17 PM 5:18 PM 5:19 PM 5:21 PM 5:22 PM 5:23 PM 5:24 PM 5:26 PM 5:27 PM 5:28 PM 5:29 PM 5:31 PM 5:32 PM 5:33 PM

8. So were your guesses correct? Please explain.

9:31:44 9:33:33 9:35:26 9:37:21 9:39:19 9:41:20 9:43:23 9:45:28 9:47:36 9:49:46 9:51:58 9:54:13 9:56:29 9:58:48 10:01:08 10:03:30 10:05:54 10:08:19 10:10:46 10:13:15 10:15:45 10:18:16 10:20:49 10:23:23 10:25:59 10:28:35 10:31:13 10:33:51 10:36:31 10:39:12 10:41:54 10:44:36 10:47:19 10:50:04 10:52:48 10:55:34 10:58:20 11:01:07 11:03:55 11:06:43 11:09:31 11:12:20

9. Describe any patterns that you see.

10. Do you think that this is a linear progression? Please explain.

+1:46 +1:49 +1:52 +1:55 +1:57 +2:00 +2:03 +2:05 +2:07 +2:10 +2:12 +2:14 +2:16 +2:18 +2:20 +2:22 +2:23 +2:25 +2:27 +2:28 +2:30 +2:31 +2:32 +2:34 +2:35 +2:36 +2:37 +2:38 +2:39 +2:40 +2:41 +2:42 +2:43 +2:44 +2:44 +2:45 +2:46 +2:46 +2:47 +2:48 +2:48 +2:49

On we have a link to the University of Nebraska at Lincoln's flash animations of daylight hours throughout the year.

() You must enter your latitude and then you can see a graph of the changes in daylight hours throughout the year for your location.

11. Make 3 or 4 observations after playing with this neat piece of technology.

12. What would you like to investigate next to understand this huge difference in daylight hours spanned in only 180 days when we are seeing increments of 2 seconds?

Sources:

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