HERCULES
Hercules is a distinctive constellation, the fifth largest in the sky, best visible from late spring until early autumn. The central trapezoidal set of four stars is fairly easy to spot although the stars at magnitude 2 and 3 are not that bright and indeed Hercules has no first magnitude stars.
Hercules contains two of the most
conspicuous globular clusters: M13,
the brightest globular cluster in the northern hemisphere, and
M92. M13 is visible to the naked eye like star
of 4th mag. In smaller telescopes it appears as a misty patch being more dense
towards the centre, with stars being resolved in the centre in modest amateur
telescopes. Large scopes reveal a nearly perfect sphere of stars.
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