Derekscope

• Today, 5th December marks the start of the Geminid Meteor Shower, though it hasn’t yet reached its peak.
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• The night of peak activity will be on Saturday 13th thru Sunday 14th December 2025.
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Triangle of light – the Moon, Aldebaran, and the Seven Sisters (M45)

• Look at the east horizon – the Supermoon forms a triangle with the Seven Sisters and Aldebaran.
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• Many mistake Aldebaran for Mars but here’s how to tell – stars twinkle, planets don’t!”
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Cold Moon

• Cold Moon
  – Full Moon in December is often associated with long, and crisp nights before the solstice on 21st December.

• Traditional Full Moon Names and their Meanings
  – Full Moon names reflect seasonal changes and natural rhythms observed by early cultures, particularly those influenced by UK colonial traditions and Native American heritage.
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  – Learn more about traditional Full Moon Names and their Meanings ~ Read more.
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• This is one of the most striking lunar events of the year, as the Moon passes directly in front of the famous open star cluster in constellation Taurus.
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• Binoculars – best for casual observers, you’ll notice stars blinking out as the Moon’s limb moves across.
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Your guide to the night sky this month

(Click below the button for more information)

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Algol Minima

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• The bright variable star Beta Persei (Algol) reaches its minimum brightness at 19.55 pm in the evening on Thursday 27th November and will be visible from the UK.
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• Here’s a list of upcoming minimum brightness times for Algol – read more.

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• The Moon will be in its First Quarter phase, reaching exact alignment 50% disk illumination at 07.38 / 7.38am in the constellation Aquarius.
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• The Moon will be well-placed in the southern sky during the evening hours.
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• Sunset is around 16:00 / 4pm, so the Moon will be visible shortly after twilight.
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• Capturing lunar features like craters and mountain ranges along the terminator ~ great for astrophotography.
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Algol Minima

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• The bright variable star Beta Persei (Algol) reaches its minimum brightness at 23:07 pm in the late night on Thursday 27th November and will be visible from the UK.
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• Here’s a list of upcoming minimum brightness times for Algol – read more.

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Algol
The bright variable Star Algol
reaches minimum brightness.
(23:07 / 11.07pm)
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• The bright variable Star Beta Persei (Algol) reaches minimum brightness.
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• This variable star in Perseus varies from its brightest at magnitude +2.1, dropping to +3.4.
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• Even when dimmed, Algol is still visible to the naked eye.
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• Here’s a list of upcoming minimum brightness times for Algol that are well-placed for UK observers in November 2025.
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• Read more – Algol
  – How to find Algol in Perseus?
  – Deaf astronomer John Goodricke

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Algol Minima

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• The bright variable star Beta Persei (Algol) reaches its minimum brightness at 02:19 am in the early morning on Tuesday 25th November and will be visible from the UK.
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• Here’s a list of upcoming minimum brightness times for Algol – read more.

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