Mount Wilson Observatory 150-Foot Solar Tower Telescope - Photos Then and Now on Waymarking.com

The 150-foot solar tower telescope at Mount Wilson Observatory was constructed to study the position, strength, and polarity of magnetic fields on the Sun. These measurements have been made since 1912, a record that allows long-term changes related to the 11-year sunspot cycle to be tracked.

Construction on the tower began in 1909.

The telescope is constructed vertically to take advantage of the steadier air above the Sun-baked ground.

The Solar Cycle Program is a long-term project at UCLA that uses this facility to provide high-quality maps of the Sun's activity on a daily basis.

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The Solar Observatory under construction in 1910:

The Solar Telescope today:

Year photo was taken: 1910

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