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Astronomical question and answer 214

 

Frank L. Preuss

 

What is seen two days after new moon?

 

In the morning the visibility to the sea is bad; one cannot see it; the sky is overcast. Only after the sun is a couple of diameters above the horizon one can see it, but only partly, because the sky is almost completely cloudy. An observation of the moon one can forget.

Two days before new moon I surprisingly had still seen a waning moon crescent and so it could today, two days after new moon, also be that I now see a waxing moon crescent after sun set, but new moon is indeed not a thing that happens, as we have seen with the picture of Novosibirsk, the whole day, but at a very definite time of a the day, which one can fix to the minute. And that must therefore not be midday, in the middle of the day.

Before sunset there are no clouds in the sky, but it is hazy and one sees nothing but the sun in the sky - and its court. Only at a fair distance from the sun the blue sky can be seen.

Thirteen minutes after sunset I saw the crescent of the moon. The sky was still bluer than black. The moon was quite high up in the sky, at a place where I did not expect it und it was probably already there some time before I saw it, may be even while the sun was still up. The moon pointed in the direction were the sun had set, but lower. I still could see the landscape before me; it was not really dark yet.

The sunless areas of the moon have the same colour as the surrounding sky, blue. I can see no stars.

It is now half an hour after sunset. The horizon is reddish, the sky not really black, still no stars. The moon is no longer white, but yellow, and now stands more out against the sky.

It is now three quarters of an hour after the sun set. It is nearly completely dark now. I can clearly see the, reddish, sunless areas of the moon and even clearer the edge of the moon there, like a fine shining half ring. I can see the first stars. There still seem to be no clouds in the sky.

It is now one hour and fifty minutes after sunset. The moon is now a little reddish. It moves about towards the place where the sun set.

It is now just under two hours after sunset and the crescent is now about 3 crescent lengths away from the horizon and turns paler, since the visibility seems to get worse.

It is now 2 hours after sunset; the crescent is about 1 crescent length above the horizon and practically no longer visible; I can only still see it, because I know where to look.

 

This is the end of "Astronomical question and answer 214"
To the German version of this chapter: Astronomische Frage und Antwort 214

 

 

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