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Astronomical question and answer 239

 

Frank L. Preuss

 

How does the moon change from a moon that is seen during the day, to a moon that is visible at night?

 

Today it is 4 days after new moon and three days before the waxing half-moon and the crescent stands in the sky and does not seem to me to be larger than two days before.

If I would have taken a photo two days ago, I could compare it with the present situation.

It is now 20 minutes before sunset and 4.5 hours before moon set.

The sky is clear. Close to the horizon it is hazy. That part of the moon that is not illuminated by the sun is exactly as blue as the sky.

The sun has now started to set; the horizon is still somewhat hazy, but cloudless. The horizon is a little higher than the sealevel; the sunset is therefore a little earlier than the theoretical.

The sun has now set. I have marked the place on the window pane, by aligning my sights on it over the top of my standard lamp. The moon shows no changes. The sky displays the red glow of the sunset sky, but confined of a small area there, where the sun has set.

It is now 10 minutes after the theoretical sunset. The blue sky slowly changes to a black sky. But towards the horizon it is a white-grey. The part of the moon illuminated by the sun seems to slowly show the earth shine, but perhaps also not; I am not so sure.

It is now half an hour after sunset. The part of the moon illuminated by the earth only, now stands out in coulor a little against the already more black sky. The horizon is still in twilight and also a little reddish. The sky is practical cloudless. But the crescent now also seems to be larger, and 4 days after new moon and 3 days before waxing half-moon seems to be right.

It is now one hour after sunset and almost nothing is seen any more of twilight.

The moon is now a shining crescent giving light, white-golden, and stands clearly out against the black sky and dominates the night sky. During the day the crescent was merely white and the sky blue and the colour of the moon crescent was the same as that of the clouds.

Several stars are now visible.

Since it was still some time until the moonset, I had lain down for a break, but then only woke up, when the moon had already set, and could consequently not establish how far the place of the moonset differs from the place of the sunset.

 

This is the end of "Astronomical question and answer 239"
To the German version of this chapter: Astronomische Frage und Antwort 239

 

 

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