Today’s Astronomical Events – July 15th, 2015

Venus and Jupiter are fast disappearing into the evening twilight. Where once, just a short time ago, they remained above the horizon for hours after sunset, they now set just ninety minutes or less after the Sun. Observers in the northern hemisphere are rapidly seeing their chances for observation vanish with the twilight itself.

Take the opportunity tonight to see the two planets with Regulus, the brightest star in the constellation of Leo the Lion. Those in the United Kingdom may have difficulty spotting the star in the darkening sky, but the further south you live, the better your chances of catching the trio. If you miss them tonight, try again on the 18th when the waxing crescent Moon will join celestial threesome.

(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.)

Images courtesy of Mobile Observatory.



05:21 UT – The almost new Moon passes Mercury. (Mercury: 91% illuminated, magnitude -1.4, diameter 5.3”. Gemini, not visible.)

06:05 UT – Venus passes Regulus. (Venus: 22% illuminated, magnitude -4.5, diameter 40.5”. Naked eye, Leo, evening sky. See images above.)

08:26 UT – The almost new Moon passes Mars. (Mars: 100% illuminated, magnitude 1.6, diameter 3.6”. Gemini, not visible.)



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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