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Meteorology   


they blow from the place of sunrise. So the distinction of cold and

hot or warm is the basis for the division of the winds into

northerly and southerly. East winds are warmer than west winds because

the sun shines on the east longer, whereas it leaves the west sooner

and reaches it later.

Since this is the distribution of the winds it is clear that

contrary winds cannot blow simultaneously. They are diametrically

opposite to one another and one of the two must be overpowered and

cease. Winds that are not diametrically opposite to one another may

blow simultaneously: for instance the winds from Z and from D. Hence

it sometimes happens that both of them, though different winds and

blowing from different quarters, are favourable to sailors making

for the same point.

Contrary winds commonly blow at opposite seasons. Thus Caecias and

in general the winds north of the summer solstice blow about the

time of the spring equinox, but about the autumn equinox Lips; and

Zephyrus about the summer solstice, but about the winter solstice

Eurus.

Aparctias, Thrascias, and Argestes are the winds that fall on others

most and stop them. Their source is so close to us that they are

greater and stronger than other winds. They bring fair weather most of

all winds for the same reason, for, blowing as they do, from close

at hand, they overpower the other winds and stop them; they also

blow away the clouds that are forming and leave a clear sky-unless

they happen to be very cold. Then they do not bring fair weather,

but being colder than they are strong they condense the clouds

before driving them away.

Caecias does not bring fair weather because it returns upon

itself. Hence the saying: 'Bringing it on himself as Caecias does

clouds.'

When they cease, winds are succeeded by their neighbours in the

direction of the movement of the sun. For an effect is most apt to

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