It shows the change of the brightness of the sky according to the age of the sun, the moon, the moon and the moon.
The dark time zone of the night sky can be confirmed at a glance, so please use it as a reference when making a schedule for star observation, astronomical observation and observation.

日 の 出 Depending on the location, the time of sunrise, entry, moonrise, and entry will change, so please set the location you want to check. By default, the current position obtained by GPS is displayed.

精度 As a result of calculation, accuracy can not be guaranteed. Please use on your note.