2008, december 12th.

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Declinations.

It's december 12th, near the winter solstice. The Sun declination is >23° south; the Moon's around 27° north.

Moon phase.

It's full moon: the Sun and the Moon are on opposite sides relative to the Earth.

Opposed signs.

When the Moon presents the declination sign opposed to that of the Sun, and moreover also its position sign, relative to the Earth, is opposed to that of the Sun, the two spatioles, in a semi-diurnal tidal basin, act either both in advance, or late. It depends.

Near midday, while the Sun is over the meridian (curve A), the Moon is over the opposite meridian (curve B). Both spatioles will be late.

Near midnight, while the Sun is over the opposite meridian (curve B), the Moon is over the meridian (curve A). Both spatioles will be in advance.

The graph of the spatiole times in the lagoon of Venice
(semi-diurnal tidal basin).

>> time >>

The passage of the two spatioles at midday.

The theoretical centre of the moon spatiole will be at Venice at 12.26 (u.t.+1) [curve B, decl. 25° north, late].

Almost at the same time, the sun spatiole [curve A, decl. 23° south, late].

No considerable effect on the water level in the lagoon. The effect will be experienced much later - because of what has taken place where the water depth is substantial - when the related tidal wave comes, the #11, which will be at its highest level at around 23.25 (u.t.+1).

The passage of the two spatioles at midnight.

At around midnight, an inverse combination will take place, when both spatioles are in advance, having to apply the curve A for that of the Moon, and the curve B for that of the Sun.

The theoretical centre of the moon spatiole will be at Venice at 23.43 (u.t.+1) [curve A, decl. just under 27°north, in advance].

Almost at the same time, the sun spatiole [curve B, decl. 23° south, in advance].

No considerable effect on the water level in the lagoon. The effect will be experienced much later - because of what has taken place where the water depth is substantial - when the related tidal wave comes, the #12, which will be at its highest level at around 10.10 (u.t. +1) of december 13th.

On the interval between these two tidal waves.

The wave generated near midday will form a goup of waves with that generated near midnight. The longer interval will take place during the afternoon, between the wave #12 and the wave #13.

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