Making the most of the monsoon

During the fall, winter, and spring the dry desert air provides minimum distortion for observing; hence, the astronomical observing season usually begins in October and can run through June. However, come July, humidity increases dramatically as dew points climb. The current official start of the monsoon is calculated when the dew point at Tucson International Airport reaches 54 degrees or higher for three consecutive days. Many mountain facilities receive necessary maintenance during this less-than-optimal observing period. Included is the restoration of telescope mirrors, no easy task when one considers the need for precision and care. For example, the Mayall 4-meter telescope's primary mirror weighs 15 tons and is polished to one millionth of an inch. Its reflective coating is removed, then restored to the thickness of one-thousandth of a human hair. A rainy day task, indeed.

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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