ModelPlan 177


 Michael Whiting's


 Science Faction Orrery


This astronomical model is a mixture of fact and fiction. As well as the Sun, Mercury, Venus and Earth/Moon,  it includes 5 other bodies which as recently as 1990 have been observed by astronomers and sometimes authenticated, but which ultimately have proved to be non-existent.


The complex nature of the gearing results in the calculations of the rotational and revolutionary periods being similarly complicated; a table of calculations is included in the text for modellers seeking verification of the periods.


Ref: MP177   20 pages   Price:  8.90