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Corona
The outer layer, and hottest part, of the Sun's atmosphere
Equinox
This is the time when the Sun crosses the celestial equator. There are two equinoxes; Vernal (Spring), around March 21st and Autumnal (Autumn) around September 23rd. On these dates, day and night are equal. Actual dates and times vary due to the Earth's precession
Terminator
The boundary between day and night regions of the moon's, or a planet's, disc
We welcome questions and enquiries.
Email is the preferred method of contact as telephone conversations can take up quite a bit of time.
Please use this email link to contact us - will reply as soon as possible
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Comments and suggesstions for improvement of the site are also welcome.
Postal Address
Orion Optics UK
Units 21&22
Third Avenue
Crewe
Cheshire
United Kingdom
CW1 6XU
Telephone
Sales 01270 500089
Enquiries 01270 251559
Fax
01270 251213
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