Between dusk and dawn, a green light to the dark sky becomes visible on the R/V Mirai and gives a sword to Orion.
The light is a part of the Mirai LIDAR. In the sky, particles (sea salt, dust, cloud droplet, rain drop, etc.) glint with the light. The lidar collects these glints to shed light on the sky condition during day and night.
On a clear night, the lidar collects extra gleams from water vapor and nitrogen molecules.
So, I enjoy very much the green illumination of the stargazing night.
(K.T., photo by S.S.)