Winter Solstice 2023

Winter Solstice 2023 in Catfood Earth

Winter starts right now for those of us at the top of the planet. It's summer time down under. Winter Solstice 2023 rendered in Catfood Earth (03:28 on December 22, 2023 UTC).

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(Published to the Fediverse as: Winter Solstice 2023 #code #winter #solstice #catfood #earth The exact moment of Winter Solstice 2023 (03:28 UTC on December 22) rendered in Catfood Earth. )

Summer Solstice 2023

Summer Solstice 2023

Summer Solstice 2023 is at 14:58 UTC on June 21. The image above shows the exact moment of the Solstice as rendered in Catfood Earth. It's the official if not sartorial start of Summer in the Northern Hemisphere and Winter if you find yourself on the other side of the Equator.

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(Published to the Fediverse as: Summer Solstice 2023 #code #solstice #summer #winter #earth #northern #estival Image of the exact moment of Summer Solstice 2023 at 14:58 UTC rendered in Catfood Earth. )

Winter Solstice 2022

Winter Solstice 2022

Winter Solstice 2022 (December 21, 2022 at 21:48 UTC) as rendered in Catfood Earth. Winter starts right now in the Northern Hemisphere, Summer if you happen to be south of the Equator.

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(Published to the Fediverse as: Winter Solstice 2022 #code #winter #solstice #catfood #earth The exact moment (2022-12-21 21:48 UTC) of Winter Solstice 2022 rendered in Catfood Earth. )

Summer Solstice 2022

Summer Solstice 2022

Summer starts right now (09:14 UTC June 21 2022) in the northern hemisphere, winter for those with latitude signum differences. Rendered in Catfood Earth.

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(Published to the Fediverse as: Summer Solstice 2022 #code #solstice #summer #winter #earth #northern #estival Rendering of the exact moment of Summer Solstice 2022 (June 21, 2022 at 09:14 UTC) in Catfood Earth. )

Winter Solstice 2021

Winter Solstice 2021

Winter Solstice 2021 rendered in Catfood Earth (15:59 UTC, December 21, 2021). Winter begins in the northern hemisphere, summer if you happen to be south of the equator.

(Previously: Winter Solstice 2020)

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(Published to the Fediverse as: Winter Solstice 2021 #code #winter #solstice #catfood #earth The moment of Winter Solstice 2021 (15:59 UTC December 21, 2021) rendered in Catfood Earth. )

Summer Solstice 2021

Summer Solstice 2021

Summer starts right this minute in the northern hemisphere, winter for those south of the equator. Rendered in Catfood Earth.

(Previously: Summer Solstice 2020)

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(Published to the Fediverse as: Summer Solstice 2021 #code #solstice #summer #winter #earth #northern #estival Catfood Earth render of Summer Solstice 2021 (June 21, 2021, 03:32 UTC). Marks the start of summer in the northern hemisphere, winter in the southern. )

Winter Solstice 2020

Winter Solstice 2020

Winter starts now in the Northern Hemisphere, Summer to the south. 10:03 UTC Dec 21 2020 rendered in Catfood Earth.

(Previously: Winter Solstice 2019)

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(Published to the Fediverse as: Winter Solstice 2020 #code #winter #solstice #catfood #earth The exact moment of Winter Solstice 2020 rendered in Catfood Earth, including clouds and the extent of day and night around the Earth. )

Summer Solstice 2020

Updated on Saturday, February 19, 2022

Summer Solstice 2020

In 2020 the Summer Solstice is at 9:44pm UTC on June 20.

We get solstice from the Latin sol (sun) and sistere (to cause to stand) - the moment when the Sun stands still in its journey from north to south and back again.

Summer Solstice is the instant when the Sun is at its highest point in the sky, on the longest day of the year for the Northern hemisphere. This happens because the Earth is tilted by a little over 23 degrees (our planet rotates once a day, but relative to our orbit around the Sun the axis of rotation is at an angle). As we orbit the Sun this tilt means that different latitudes experience more or less sunlight over the course of a year. This pattern is most extreme near the poles. In the Arctic Circle the Sun never sets at the height of summer and never rises in the depth of winter. We mark two solstices each year, summer and winter. At the Summer Solstice the Sun is directly over the Tropic of Cancer (a little over 23 degrees north). We also observe two equinoxes, spring and fall (vernal and autumnal), halfway through the cycle when the Sun is directly over the Equator and a day is the same length everywhere.

The video below shows how the pattern of day and night changes over one year. You can see when the poles are completely dark or light, and the moment when the Sun 'stands still' before days start to get longer or shorter again.

Here's another perspective. This video shows a view from San Francisco made from pictures that each show a complete day (each vertical line on the picture was shot at a different time with noon at the center). You can see the length of day changing throughout the year. On less foggy days you can also see the position of sunset moving, especially with the days getting longer towards the end when San Francisco experiences less fog.

Summer Solstice isn't always on June 20th - sometimes it's June 21st or June 22nd. Irritatingly a day on your clock is not the same as a solar day and a calendar year is not the same thing as one trip around the Sun. This is why we have leap years and leap seconds to stay roughly in sync with celestial mechanics.

It's also interesting to note that Summer Solstice isn't when we're closest to the Sun or when temperatures are the highest. The Earth's orbit is elliptical and we're actually furthest away around the Summer Solstice (for now - this changes over time). Our Northern hemisphere summer is driven by sunlight hitting us directly rather than at an angle (seasons are driven by the 23 degree tilt and the position of the orbit more than our distance from the Sun). Temperatures continue to rise after the Summer Solstice mainly because it takes a while to heat up water, and so warmer weather lags the increase in direct sunlight (and vice versa as we head into colder weather after the Winter Solstice).

The exact moment of Summer Solstice pictured at the start of the post and the video of day/night over a year were created using Catfood Earth. Catfood Earth generates wallpaper from NASA Blue and Black Marble images to show the current extent of day and night combined with near real time cloud cover. Catfood Earth is totally free and available for Windows and Android.

(Previously)

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(Published to the Fediverse as: Summer Solstice 2020 #code #solstice #summer #winter #earth #northern #estival #video In 2020 the Summer Solstice is at 9:44pm UTC on June 20. Summer Solstice is the moment when the Sun is at its highest point in the sky, on the longest day of the year for the Northern hemisphere. This happens because... )

Winter Solstice 2019

Updated on Sunday, May 3, 2020

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(Previously)

It's the start of Winter (or Summer if you're south of the Equator). Rendered in Catfood Earth, showing December 22 at 04:19 UTC.

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(Published to the Fediverse as: Winter Solstice 2019 #code #winter #solstice #catfood #earth Winter Solstice (or Summer south of the Equator) 2019 in Catfood Earth. )

Summer Solstice 2019

Summer Solstice 2019 in Catfood Earth

Summer starts now in the Northern Hemisphere, Winter if you happen to be south of the Equator. Rendered in Catfood Earth.

(Previously)

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(Published to the Fediverse as: Summer Solstice 2019 #code #solstice #summer #winter #earth #northern #estival Summer Solstice 2019 as rendered by Catfood Earth. )