Got Starry Night Pro from my wife for Christmas, and I read through the accompanying book, the Starry Night Companion.

A few nits, for now:

P.103, it says that the Earth's equatorial diameter is 21 kilometers greater than its polar diameter. The equatorial diameter is about 42 km greater than its polar diameter--perhaps the book should have said radius.

P.48 it discusses solar eclipses and that the Moon's shadow moves from west to east on the Earth. As we saw with the recent solar eclipse, that's not always true.

P.36 it says that the Moon crosses the sky just over twelve times per year. On p.115, it says that the Moon revolves around the Earth approximately 12 times per year, once every 30 days. However, on p.118, it carefully describes the sidereal month of 27.332166 days. Clearly, those first two pages are using the synodic month of about 30 days, but that is not how long the Moon takes to revolve around the Earth. Using those figures, the Moon revolves around the Earth 13 1/3 times each year.

P.43 it mentions that the moon "is visible in the day for two weeks each month." The moon can be seen sometime during the daytime of almost every day of the month. It mentions on the same page that the moon cannot be seen day or night for about three days when it's new or nearly new.

Just noticed this:

P.102, it says "A mysterious religion, now extinct, once incorporated secret knowledge of the precession of the equinoxes. This knowledge was kept so private that only in the last few decades was it rediscovered."

I know that the precession was known more than just a few decades ago. What was it that was rediscovered? Mithraism?

Maybe you should write the company about these errors? -Colt

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