- Mercury reaches inferior solar conjunction on Thursday 20th November 2025 at 09:19am, becoming unobservable as it passes between Earth and the Sun.
o - Mercury is completely unobservable for several weeks due to solar glare.
o - Mercury will re-emerge in the pre-dawn sky in early December, becoming a morning object.
o - So wait until mid-December when Mercury gains altitude and separation from the Sun for safe and rewarding observation.
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