Magnetospheric Calendar
For the Earth magnetospheric community, these calendars include information of solar calendars, but are complemented by a 2D image of the magnetosphere, calculated in the meridian plane from the magnetic field model of Tsyganenko 1987.
The method of construction of these calendars, and a brief definition of the magnetosphere are explained HERE.
The colors are purely aesthetic, and vary with the season. You can either add the trajectory of some spacecraft as CLUSTER.
Examples for several cities in the world are freely available on our ftp server.
Other cities can be added on request.
All magnetospheric Calendars are also valid for the polar regions, indicating the midnight sun and polar nights.