The event will take place from 8 p.m. to 11 p.m. at the observatory and planetarium, 5725 Oak Hills Lane, Kelseyville.
Presenter Fred Veio has been studying the sun for many years and has built his own spectrohelioscope. He will discuss solar spectroscopes and the technical details. Amateurs can actually make their own spectroscope.
The evening event includes the lecture, a planetarium show and telescope viewing.
The suggested donation is $3 per person.
For more information, call 707-262-4121 or visit www.taylorobservatory.org.