When did The Sky at Night Season 21 Episode 5 air?
The Sky at Night Season 21 Episode 5 aired on May 18, 1977.
The Sky at Night
Your monthly journey through the fascinating world of space and astronomy with the latest thinking on what's out there in space and what you can see in the night sky.
Season 21 · Episode 5
The Solar Cycle
May 18, 1977
Sunspots are known to increase and decrease over an 11-year cycle. We have just passed through a period of minimum solar activity and the sun-spots should now be increasing, but are slow to do so. Patrick Moore and Dr Ron Maddi son discuss the possible causes of this apparent irregularity. in the solar cycle, and talk about some of the other interesting features of the sun's surface.
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