A Year of Sunrises 2

Описание: A Year of Sunrises 2

In 2021, I made a video that depicts the change in the sunrise point over the course of a year, from Dec 2020 to Dec 2021 -    • A Year of Sunrises  . With start and end points in December, the resulting curve points to the left. Had the sequence started and ended in June, the resulting curve would point to the right. I decided to combine the Jun to Dec 2021 images with six additional images Jan to Jun 2022 to make another video - A Year of Sunrises 2. And since I had obtained contingency photos in some months of 2021, I swapped in three images from 2021. Can you tell which ones they are?

About This Video

The sunrise point along the eastern horizon changes slightly from day to day. In the northern hemisphere, it moves southward from the first day of summer until the first day of winter, then returns northward until the first day of summer. Despite a popular misconception, the Sun rises due east (and sets due west) only twice per year, on the equinoxes.

The sunrise point changes due to the tilt of Earth's axis of rotation with respect to the plane of its orbit around the Sun. The change is most perceptible around the equinoxes (around Mar 21 and Sep 21) and least perceptible around the solstices (around Jun 21 and Dec 21). The farther north or south from Earth's equator, the greater the total change in the sunrise position.

In Edmonton, Alberta, at latitude 53.5 N, the change in the sunrise point in the six months between solstices is quite large (84 degrees). One of the best places in Edmonton to see the sunrise point change along a familiar horizon is Valleyview Drive, which is where I photographed sunrise once a month for a year (as near as possible to the 21st of the month as clear skies in the morning permitted).

This video shows the 13 sunrise images from Jun 2021 to Jun 2022 and stacks them to visually depict the change in the sunrise point over a year.

Image Acquisition

Camera: Canon 60D
Lens: Canon EF-S 10-18mm, at f/4.5, 10mm FL
Mount: Manfrotto tripod with geared head

Image Processing
Processed with GIMP.

Video
Made with Pro Show Gold.

Footnote
The final image stack can be viewed in high resolution here:
https://www.flickr.com/photos/5385134...

Essential Data
Here's the essential data from the 13 shoots. Each shoot was planned to capture sunrise with the Sun 0.5° to 1.0° above the horizon.

Date Rise R Az D Image I Az Alt Temp ( WC)
Sun 2021 06 20 05:04 46.5 0.0 05:16 48.9 0.9 10
Sun 2021 07 24 05:07 54.0 1.2 05:48 56.2 0.9 10
Wed 2021 08 18* 06:19 66.7 1.8 06:33 69.4 1.4 8
Sun 2021 09 19* 07:15 86.6 2.2 07:25 88.7 1.0 7
Wed 2021 10 20 08:11 106.8 0.6 08:21 108.8 0.9 0
Tue 2021 11 23 08:15 124.7 0.8 08:22 126.1 0.5 -4 ( -7)
Fri 2021 12 17* 08:46 130.4 0.1 08:55 132.1 0.6 -28 (-34)
Wed 2022 01 19 08:38 124.3 0.9 08:48 126.3 0.8 -25 (-29)
Tue 2022 02 22 07:37 106.0 0.6 07:50 108.5 1.4 -23 (-31)
Mon 2022 03 21 07:33 88.3 0.0 07:44 90.4 1.1 -6 ( -9)
Thu 2022 04 21 06:20 68.4 0.0 06:26 70.3 0.9 0 ( -4)
Sat 2022 05 21 05:24 53.1 0.0 05:34 55.1 0.8 3
Sun 2022 06 19 05:04 46.5 0.0 05:16 49.0 0.9 14

Alternate image from original A Year of Sunrises.

Rise = Sunrise time
R Az = Rise azimuth
D = Delta azimuth from 21st of month
Rise = Image time
I Az = Image azimuth
Alt = Altitude of Sun at image time (degrees)
Temp = Temperature at image time
WC = Wind Chill