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Performance Improvement For Achromatic Refractors

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Anyone who owns a conventional achromatic refractor will be aware of the blue halo surrounding any white or bright object at high powers. Most people will know that this is…

Visual comet hunting – A deeper look by Martin McKenna

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Resident comet hunter and EAAS member, Martin McKenna has been observing comets since 1997 and has made it his passion in the field of astronomy. He has clocked up over…

Why observe comets? by Martin McKenna

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Resident comet hunter and EAAS member, Martin McKenna has been observing comets since 1997 and has made it his passion in the field of astronomy. He has clocked up over…

Visual Comet Hunting by Martin McKenna

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INTRODUCTIONVisual comet hunting is the systematic search for undiscovered comets by the visual amateur observer using the naked eye, binoculars or telescope. It is a way of exploring the entire…

Saturn, The Lord Of The Rings

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December 2003On New Years Eve the planet Saturn will be closer to Earth and brighter than at any time in three decades. All month long, everyone can enjoy Saturn at…

Choosing Your First Telescope

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Choosing Your First Telescope - A Beginner's Guide by Stevie Beasant & Eamonn KeyesA question which keeps popping up over and over again on the NIAAS forum is "How do…

Astronomy Formulae by Andrew Johnston

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IntroductionHere is a set of formulae and numbers that I have always wished was in one place. Now they are. Enjoy.f ratio (or focal ratio) = primary mirror focal length…

Choosing a telescope By Andrew Johnston

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There are three types of telescopes for the Amateur Astronomer, refractor, reflector and catadioptric. All these designs have the same purpose, to collect light and bring it to a point…

A Short Guide to Choosing Eyepieces by Neil Patterson

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The following is a basic guide to some of the factors to take into consideration when choosing eyepieces. It is based on my experience but also on conversations with and…

How to make a very sensitive jam jar magnetometer by Robert Cobain

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Hi all,Just thought I would write up the instructions for making a very sensitive jam jar magnetometer. The plans are based on instructions found on the internet, but it was…