Today’s Astronomical Events – July 16th, 2015

Mercury is at perihelion today, meaning that its at its closest point to the Sun. Meanwhile, closer to home, the Moon turns new; in the image above, you can see the positions of the inner planets and the Moon between the Earth and the Sun. (The sizes of the planets and the distance of the Moon from the Earth are not to scale and have been exaggerated for the purposes of illustration.)

(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.)

Image courtesy of Mobile Observatory.



01:24 UT – New Moon. (Gemini, not visible.)

05:24 UT – Mercury appears 6’ south of Mars. (Mercury: 93% illuminated, magnitude -1.5, diameter 5.3”. Mars: 100% illuminated, magnitude 1.6, diameter 3.6”. Gemini, not visible.)

19:06 UT – Mercury is at perihelion. Distance to Sun: 0.308 AU (94% illuminated, magnitude -1.5, diameter 5.2”. Gemini, not visible.)

The globular cluster M55 culminates at midnight tonight. (Magnitude 7.4. Sagittarius, all night.)



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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