Prepared by members of Commission 21 "Light of the night sky'' of the IAU, including most of the recent (vice-)presidents.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

Copyright by the European Southern Observatory (ESO)
This email address is being protected from spambots. You need JavaScript enabled to view it.