Solstice line and actual date.

[Will Foster]

Another question from a Newb.

As seen in the photo I have lines up the winter solstice line with the sun line.
I assume this is the moment of solstice.

Can someone please explain why all the websites I am seeing have the solstice at a different time?

12/21/25 10:03 AM.

[Georg Zotti]

To discuss this, you must tell us what websites you are seeing. Solstice will be at 15:03UT on 2025-12-21.

A website giving 10:03 is 5 hours to the west, i.e. something across the Atlantic. 

[Georg Zotti]

I see Stellarium in perfect agreement, 15:03 UTC.  In this moment, geocentric ecliptical longitude = 270°. 

philfrom...@gmail.com schrieb am Donnerstag, 23. Oktober 2025 um 13:48:28 UTC+2:

Thanks for the reply.

Here are some links:

"The actual moment of the solstice in 2025 will occur at 3.03pm GMT in the UK"
When is the winter solstice? The shortest day | Royal Observatory Greenwich

Winter Solstice – When Is Winter 2025 and 2026?

"It comes at 15:03 UTC (9:03 a.m. CST) on December 21."

2025 December solstice: All you need to know

Am I missing something as far as different ways to express the solstice?