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Blackett Observatory Dome
Welcome to the Marlborough College Blackett Observatory, home to the largest refracting telescope in Wiltshire. Learn more...
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SpaceWeather | More weather... Coordinates: 51.25.25 N and 1.44.24 W
Marlborough College
Oxford Astrophysics
Green Templeton College

Summer School week 2: Observatory open Monday and Tuesday. Places limited. Book in Office


What's Up - Week of 26th July

  • Astronomical twilight ends at 00.11 BST at the start of the week and 23.39 BST at the end

  • The Moon is Full (Thunder Moon) on Monday and will then wane to Last Quarter at the start of next week

  • After sunset in the West first Venus, then Saturn and then Mars appear (with Mercury near to Regulus but close to the horizon). Saturn and Mars are within 2 degrees next Friday and Saturday

  • The Sun has 2 sunspot regions 1089 and 1090, though large, these are not active at present

  • There are no evening ISS passes this week

  • There are two really bright late evening Iridium flares on Wednesday at 23.17.56 BST, 26 degrees altitude in W and Friday 23.15.06, 23 degrees in W

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Featured Blackett Image



The innermost of the Galilean moons of Jupiter, coloured due to its sulphurous, volcanic surface, crosses in front of the parent planet, preceded by its sharp black shadow. (NASA, Hubble)