Lunar Day Zero

  • Tammy Plotner
Part of the Astronomer’s Pocket Field Guide book series (ASTROPOC)


We begin our travels together with the New Moon (Fig. 1.1). By astronomical definition, the Moon is now in conjunction with the Sun as seen from Earth. The shadowed portion of the side that always faces us is pointed our way… and we simply cannot see it. It is there - only hidden. The moment of conjunction in ecliptic longitude is unique, occurring at a slightly different time each lunar month and you will find its precise time listed in the tables at the back of this book. We will even learn more about how to deal with these “times” as time goes on! Within a matter of hours our nearest astronomical neighbor will have moved away from the Sun’s glare and our “Lunar Days” will begin. Let us take a moment now to prepare ourselves.


Bright Image Primary Mirror Astronomy Application Exit Pupil Ecliptic Longitude 
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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.CaledoniaUSA

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