to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Eise Eisinga Planetarium: The orrery built by wool carder Eise Eisinga from 1774 to 1781 in his living room, the oldest functioning planetarium in the world
Eise Eisinga Planetarium: Wijzerplaat in het plafond met de hemellichamen als hangende bollen