Blader door items (49 in totaal)

This book chronicles the remarkable resurgence in small telescope astronomical research sparked by three technical breakthroughs: compact Schmidt-Cassegrain telescopes, personal computers, and affordable CCD cameras. Every night, cosmic mysteries are…

Space telescopes are among humankind’s greatest scientific achievements of the last fifty years. This book describes the instruments themselves and what they were designed to discover about the Solar System and distant stars. Exactly how these…

Many observers harbor misgivings about their telescope. The manufacturer may have guaranteed accuracy to one-quarter wavelength or as diffraction-limited but most telescope users have, at best, only a hazy idea of how to personally verifying such…

Call it a rite of passage. Call it the first step on an exciting journey. Call it what you want, but buying a first telescope is a leap of faith. For the beginning astronomer it is a gamble -- a hunch concerning the nature of a hobby not completely…

A collection of working models of sundials and timedials to be cut out and glued. The models include polar, equatorial, sunbeam equatorial, traditional, three-in-one and a nocturnal dial and include a minibook which gives background information,…

Featuring a collection of models to make, they tell the time from the sun during the day and the moon at night. Another mimics the motion of the sun and moon across the sky on any day of the year. The moon globe names all the seas, craters and…

Have you every wanted to build a sundial or to understand how one works? Then you have probably been frustrated as you search vainly for help. Most books on the subject are either rare out-of-print works published centuries ago and available only in…

Into this breach step Rutten and van Venrooij, two Dutch astronomers who wanted to know more about optics but found that resources were generally unavailable to amateurs. So, they wrote their own. Telescope Optics is a compendium of optical…

Cet Exellent petit ouvrage, traduit de l'allemand, est un guide pour l'amateur, surtout le débutant, qui désire se procurer une lunette ou un télescopeet commencer des observations. L'auteur commende par donner des consiels précieux pour le choix…