Sometimes it's just as simple as this, the sun goes down and you're in the right location.
Here, the Atlantic and the sunset fast approaches. The sun appears from behind a thick band of cloud just before it sets in the west on the autumn equinox when day and night are of equal length because the Sun moves across the equator.
In 2024 the autumn equinox is at 13:44 on September 22nd.
The days have of course been getting shorter since the summer solstice but here at the autumn equinox summer truly leaves us in Ireland and the shorter days are balanced out by longer nights.
The sun will of course rise in the east again on the following morning but we will see less and less of Earth's lifegiver until December 21st when the day length reaches its shortest.