180

A common moderate oven setting is 180 degrees Celsius (domestic recipes, worldwide). Roughly gas mark 4, or 350 degrees Fahrenheit — the three scales converge on the same everyday setting because ovens were marked for whichever was local.

There are about 180 million tonnes of sugar produced each year. Figure as of 2023. Roughly four-fifths from sugarcane and the rest from sugar beet, which is why the crop is grown both in the tropics and in northern Europe.

180 °C is the default moderate oven temperature in British and European recipes, corresponding to gas mark 4 and to roughly 350 °F — a conversion usually rounded, since 180 °C is exactly 356 °F. Fan ovens are conventionally set about 20 degrees lower for the same effect, so the same recipe may be written 180 °C, 160 °C fan, gas 4 in a single line. The figure is a convention of recipe writing rather than anything the food requires.

To 'do a 180' means to reverse a position completely, from the half-turn that leaves you facing the way you came. The idiom is common enough that the mistaken form — 'a 360' for the same idea — is now heard regularly, though a full turn returns you to where you started and so says the opposite. In freestyle skiing, skateboarding and BMX the numbers are literal degrees of rotation and the figures run 180, 360, 540, 720 and beyond.

The 180th meridian is the line of longitude opposite Greenwich, and the International Date Line follows it only approximately: the line bends around Russian territory, the Aleutians and several Pacific island states so that no country is split across two calendar dates. Kiribati moved a large section of it eastward in 1995 to bring its whole territory into one day. The date line is therefore a political boundary drawn near a geometric one, and it has no basis in any treaty — countries simply declare which side they are on.

180 is the maximum score achievable with three darts in a single turn — three treble 20s (20 × 3 = 60, thrown three times) — and is announced by tournament callers as 'ONE HUNDRED AND EIGHTY!', one of the sport's most recognisable moments.

180° is the measure of a straight angle (a half-turn) and, by a fundamental theorem of Euclidean geometry, the sum of the interior angles of any triangle.