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Clavius Crater, 


            Bruce Rohrlach

Clavius Crater

Technical card

Resolution: 1343x993

Date:Sept. 21, 2018

Focal length: 7000

Seeing: 4

Transparency: 7

Locations: Boronia, Melbourne, Victoria, Australia

Data source: Backyard


Clavius Crater - the second largest crater on the near-side of the moon (225 km wide) under quite good observing conditions tonight. The crater is named after Christopher Clavius, a 16th century German Jesuit astronomer and mathematician who designed the Gregorian calendar which most of the world uses today.

This is a test of a ProPlanet IR 642 BP IR-Pass filter which excludes all light below wavelengths of 642 nano-metres (i.e. blocks all visible light) and only passes Infra-Red light (642-842nm), a longer wavelength which is not as prone to atmospheric distortion, resulting in steadier seeing and cleaner lunar imagary. Happy with this filter.



Bruce Rohrlach
License: None (All rights reserved)


Clavius Crater, 


            Bruce Rohrlach