probably know that a year is about 365 days long…the time it takes the Earth
to orbit the Sun exactly once. Mid-Summer to Mid-Summer, birthday to birthday,
probably know that one in every four years is a 'leap' year and has 366 days.
those century years (1300, 1700 etc) whose first two digits (13, 17 etc) are not
divisible by 4…
- exactly how long does the earth take to go round the sun (a solar year)?
doubtless noticed that there’s a ‘full’ moon every month, but you might
not know that once every 29.5 months, there are two full moons in a
calendar month, because one comes right at the start, while the second just
squeezes in at the end…
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