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  • More from BBC Sky at Night

    BBC Sky at Night3 min read
    How To Use Setting Circles
    W hile many modern mounts have Go-To navigation, beginners often start off with a telescope setup that includes a manual (nonGo-To) equatorial mount. Most manual equatorial mounts come with a dial on their RA and dec. axes, which together are known a
    BBC Sky at Night3 min read
    Deep-sky Tour
    Our first target needs no introduction. The Double Cluster is a pair of open clusters, NGC 869, also known as h Persei, and NGC 884, known as Chi (χ) Persei, in the northern part of Perseus. The classic way to locate them is to extend the line from G
    BBC Sky at Night1 min read
    A Favourable Ganymede Shadow Transit
    Ganymede is the Solar System's largest moon, with a diameter of 5,268km. That's 41.3 per cent of the diameter of Earth. Ganymede's mean orbit places it 1,071,600km from Jupiter's centre, and when it passes between Jupiter and the Sun it casts an enor

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