by Mary Hrovat
There are worse places to be a stargazer than south-central Indiana; it’s not cloudy all the time here. I’ve spent many lovely evenings outside looking at stars and planets, and I’ve been able to see a fair number of lunar eclipses, along with the occasional conjunction (when two or more planets appear very close together on the sky) and, rarely, an occultation (when a celestial body, typically the moon but sometimes a planet or asteroid, passes directly in front of a planet or star).
For example, I was lucky enough to have clear skies in March 1996 on the night comet Hyakutake made its closest approach to Earth; from a relatively dark site, it was visible near the North Star, its long faint tail sweeping the sky like a hand on a clock. I also got to see the conjunction of Jupiter and Saturn in December 2020, the closest such conjunction since 1623. There were also a number of clear evenings before the conjunction, so I could watch the two planets drawing closer to each other on the sky. A viewing party for comet Hale-Bopp, on a night in 1997 when the moon was full and Venus was visible in the western sky after sunset, was notable for clouds coming and going, but we got to see the comet and the planet, and the moon was remarkably pink through hazy clouds.
However, we do get a lot of overcast nights. Indianapolis, the closest city for which I can find data, receives 55% of available sunshine; annually, it sees 88 clear days, 99 partly cloudy days, and 179 cloudy days. As a result, I’ve missed a fair number of lunar eclipses, meteor showers, and other astronomical events over the decades. When I was an astronomy student in the 1980s, I remember standing on the balcony of the observatory with a classmate, wondering whether the clouds that had moved in were there to stay. The climate here fosters doubt about the possibility of clear skies. Read more »