Today’s Astronomical Events – July 22nd, 2015

The globular cluster Messier 75 reaches its best visibility of the year tonight. Located in the wilderness between Sagittarius and Capricornus, it’s not an easy object to locate but scanning the area with binoculars first might help the search.

Discovered by Pierre Méchain in 1780, this dense star cluster lies some 67,500 light years away and is thought to be about 67 light years in diameter. It shows a large, bright core when observed through a telescope.

(Click on the image to enlarge. Adapted from 2015: An Astronomical Year, available in Kindle and paperback formats from Amazon in the US, Canada and the United Kingdom.)

Map courtesy of Mobile Observatory. Photograph taken by the author using Slooh.



11:02 UT – Venus is stationary prior to beginning retrograde motion. (16% illuminated, magnitude -4.4, diameter 45.3”. Naked eye, Leo, evening sky.)

Mercury leaves Gemini and enters Cancer. (100% illuminated, magnitude -2.0, diameter 5.0”. Not visible.)

The globular cluster M75 culminates at midnight tonight. (Magnitude 8.6. Sagittarius, all night. See images above.)



Events in bold involve objects and/or events that are visible with the naked eye.

All times are in Universal Time (UTC). To convert the time to your timezone, click here.

2015 An Astronomical Year (Kindle Edition) 2016 An Astronomical Year Paperback Cover 2016 The Night Sky Sights The Astronomical Almanac 2015-2019

2015: An Astronomical Year

2016: An Astronomical Year 2016: The Night Sky Sights The Astronomical Almanac (2015-2019) The Amateur Astronomer’s Notebook (Pocket Edition)

(Kindle & Paperback)

(Kindle & Paperback) (Kindle & Paperback) (Kindle & Paperback)


Amazon – US

Amazon – US Amazon – US Amazon – US Amazon – US
Amazon – UK Amazon – UK Amazon – UK

Amazon – UK

Details of all available books across the world can be found here or by visiting the author’s page on Amazon. If you have any comments or questions, please feel free to contact me at astronomywriter “at”


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