In the online activity, "Reflections of a Star - How to Find the
[Apparent] Angular Diameter of the Sun," the Sun's image is reflected
from a mirror through a bottle of water onto a white projection screen.
The idea seems simple enough, although there is no mention of the
purpose of the bottle of water--why not simply reflect the Sun's image
directly onto a projection screen? Enquiring minds want to know!
Sunny Days & Starry Nights!
Walter Sanford, Planetarium Teacher
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