Starwheel

``` Starwheel is a number puzzle drawn on an old star chart. The board is a wheel of seven spokes and six rings. Place a star and it slides inward toward the centre. A star burns when its number matches the count of stars on its spoke, or the length of its unbroken row around its ring. Burning stars crack the hatched stars beside them, the wheel settles, and one well-placed star can set off a chain that sweeps across the chart. There is no limit on how many stars you place. Instead, every few stars a ring of hatched stars rises from the centre and pushes everything outward. Chart the constellation before a rising ring pushes any star past the rim. THE SKY WHEEL Every level is a real star. Chart all of a constellation's stars and its engraved figure, taken from Johannes Hevelius's star atlas of 1690, inks itself into your sky. Its field notes open too: the common name, the brightest…