The moon has an elliptic orbit and considerable eccentricity owing to what, it appears sometimes very close concerning Earth. But there are also other reasons for which the Moon in a firmament of extraordinary big sizes.
Hypotheses
There is no standard explanation why the Moon sometimes looks very big. Some experts believe that it is all about prospect. Comparing objects which sizes are known (silhouettes of the remote trees, buildings, etc.) and that is closer to the observer in comparison with the shining disk of the Moon, illusion is created. In comparison with them the Moon also looks big. Such here optical illusion.
Express as well other assumptions: the brain of the person represents a heavenly dome not as the correct hemisphere, and a little flat to the horizon. In that case that and objects on the horizon, including the Moon, it considers udalenny, those that in a zenith. But the brain perceives the angular size of the Moon the same, as well as is actually (about 0.5 °); immediately enters the automatic amendment on distance and receives different images of the same object.
Ecologists say that the big sizes of the Moon are caused by environmental pollution. But the ratio of the sizes of Earth and the person (and all mankind with its activity), is equal to a ratio of atom and orange.
Sometimes it is possible to hear the assumption of influence of some atmospheric phenomena on refraction of sunlight which then is reflected from the Moon and affects its color. And Earth can just and the Moon is closer to each other at this time? Such assumptions are more close to the truth.
In fact
To observe the moon of extremely big size often, it is not necessary. But the keen observer will notice that the disk bigger, than usually the size, is always a little more red. Reddening can be caused only by one — influence of what is between an eye and the Moon. It is natural the atmosphere. More true it a state. The higher it density, the more its property to increase. The example of that the stones which are at the bottom of a transparent reservoir and the small fishes seen always the bigger size than is actually. Water is 100 times more dense than air. Air density is different depending on humidity and pressure too. The atmosphere can be sometimes extremely saturated moisture, At large-scale change of weather conditions, the considerable mass of air over the place of observation is in more squeezed state, than usually. And the more thickness of dense air, the more its property to increase and cause distortion of light causing reddening. On the equator the speed of rotation of Earth is much more, than on poles. Therefore because of centrifugal forces, the planet is extended in the parties, and together with it and the atmosphere. On the equator she is more fat, than in middle latitudes.
Observing the Moon on the equator, it is possible to see it in a phase of a new moon, in the look turned "up by horns", similar to the boat. In the ancient time, the Pacific seafarers believed that it is the boat of god of the sea calling them on opening of new lands.
Having added on this factor to distance in an orbit, to weather conditions, density and humidity — on the equator can see sometimes the Moon such that if to tell — will not believe.