How about these?
Airy Disk: general term for the proprietary 'Frisbee'.
Astigmatism: aversion to the television programme 'Top Gear'.
Astronomical Unit: any measurement not capable of being envisaged by the human mind.
Catadioptric: relating to feline spectacles (yes, such things actually exist!).
Coma: the stuff on your comb that should have remained on your head.
Dark Matter: the horrible material that accumulates in domestic ovens.
Event Horizon: Any occurrence which seems unattainably distant in time (e.g. one's next pay packet).
Extragalactic: a change in routine relating to unexpected presence of children (twins, visiting relatives, etc.)
Lunation: A country experiencing civil war.
Meteorite: Perfect weather for a picnic.
Occultation: Collective noun for a group of astrologers.
Retrograde Motion: non-modern dance routines.
Satellite: an old, folding aluminium camp chair.
Solar cycle: bicycle propelled by solar energy.
Solstice: being alone on a sunny day.
Spectrum: the bit that joins the two halves of a pair of spectacles.
Telescope: an instrument designed to reduce one's bank balance.
Zodiac: a type of marine craft; those constellations which affect rationality in the human mind.
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