Wide-field telescopes and eyepieces are best for viewing large nebulae. Dark skies and high altitudes improve visibility. Planning your observations, including target selection and timing, is crucial.

The moment a bullet leaves a rifle barrel, it’s dropping. To compensate for that drop and get bullets where they need to go, long-range shooters use one of two units of measure: MRAD or MOA. Both are ...

We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › You’ve no doubt heard the carpentry proverb “Measure twice, cut once” and may even have ...

This is a preview. Log in through your library . Abstract A method is presented for calculating the apparent elevation angle to be expected for an object situated in the troposphere at specified ...