* The author is part of the community of readers of La Vanguardia
Spectacular the waning moon seen from Gavà, traversed by the plane and its trails. The craters can be seen very well defined in this photograph in Las Fotos de los Lectores de La Vanguardia.
As can be seen in the image, the planes form a vapor trail after the kerosene combustion process. The gases expelled by the engine come out at a much higher temperature than that of the outside.
The sharp contrast of temperatures at a height above 30,000 feet (-50 degrees in the environment) causes the immediate condensation of the water present in this mixture of substances. This makes us see this kind of elongated ice clouds that dissolve after a short time.
The waning moon is the interval between the full moon and the new moon. Normally, reference is made to the last quarter phase.
First we see the waning gibbous moon, past the phase corresponding to the full moon, which this month of March has been known as "of the worm".
The luminous part of the Moon begins to wane as the days go by, thus again taking on the appearance of a concave (gibbous) moon, this time, in its waning phase.
Thus we will arrive at the last quarter, which is the opposite phase of the first quarter. This lunar phase corresponds to the period of days during which it is possible to observe the moon in the sky during the early morning and early morning hours.
The waning moon with the highest altitude in the sky occurs between the months of September and November, worse not between the months of March and May.
Finally, the waning crescent, waning crescent, or "old moon" is identical to the visible new moon, but in the opposite sense.
