Tuesday, August 20, 2024

Blue Moon, active Sun, size comparison

 Lots of reports of auroras are showing up on the web.  Here is what the Sun looks like today:

White light. Astro-Tech AT102ED f/7 refractor + Lunt solar wedge + ND-0.6 filter.

Hydrogen-alpha light.  Lunt LS50THa.

There is (was) an interesting detached prominence near the western (right hand) limb.

The current full Moon is a so-called "Super Moon"  because it is near its closest approach to Earth.  This causes the apparent diameter to be slightly larger than average.  Here is an angular size comparison of the Moon and Sun taken with the same telescope (AT102ED):

Orange sun superimposed on a blue moon.

 
The angular size difference of a "Super Moon" and an average full Moon is about the same as the difference between a 16" pizza and a 15" pizza viewed from 153 feet away.  Could you tell the difference?

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