This is "the archive of the sky from ground (Skylog)" using a live camera (a machinery eye). Everyday sky has calmly been recorded in the digital space.
Images are taken every one minute, and provided as daily animations.
The location and direction of the camera is fixed for archival purposes.
We refer to the time of sunrise and sunset (National Astronomical Observatory of Japan), and the sky is recorded 15 minutes before and after those times in principle. The observation is occasionally stopped due to the darkness of the sky.
Due the installation problem of the camera, artificial patterns such as circular textures and reflection are sometimes visible.
Some images are missing due to power failure and other troubles.
Multiple Viewpoints of Space and Ground
You can compare multiple viewpoints, namely, the meteorological satellite image (visible) and the live camera image, taken on the same time. The live camera is located at the center of the meteorological satellite image.
The size of the meteorological satellite image is 420km for south-north and 560km for east-west.
The resolution of the meteorological satellite image is about 1.75km per pixel. Hence small clouds on the live camera cannot be identified on the meteorological satellite image, but it is likely that large cloud bands of more than several kilometers can be identified.
The comparison of two images makes us possible to switch viewpoints from space to ground and vice versa, and have the whole image of atmospheric phenomena.