Determine the midday height of the Sun in Rostov-on-Don (f = 47 °) on the day of the winter solstice.

On the day of the winter solstice, the declination of the Sun is b = -23.5 °. h – 90 ° – f + b; h = 90 ° – 47 ° – 23.5 °; h = 19.5 °.

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