I went to planetarium with my friend. It was my first time to visit such facility. Actually it was star watching event took place in museum of science of sky. But due to cloudy condition, the event changed to watch planetarium. Anyway it was good event. planetarium was very beautiful, tons of star was projected on roof. I was surprised by the amount of stars because we can't see that amount of star on real night sky due to brightness of artificial lights such as street lump.

 lessening commentary for each star sign was aiso interesting.

In Japan, on sep 24 this year, the moon will be almost fullmoon. It is called chyusyu no meigetsu(中秋の名月)in Japan(hearvest moon in English). According to commentary,the moon was important to help harvest due to brightness in night. In ancient age, there was no artificial light so fullmoon's brightness helped harvest in nighttime or in early-evening.

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