Are there some locations on the globe inherently better than others for sighting the new crescent?
YES. These are locations that have factors that are better for optics than other locations. Locations looking out over the ocean are better than those looking in the direction of a populated city. Poor air transparency due to molecules and dust suspended in the air is also bad for visibility. The air transparency is better for higher elevations like mountain tops. Urban and industrial areas are at a disadvantage compared with rural and more arid areas. The average cloud cover is significantly higher at high latitudes and near equator than in the subtropics and lower temperate zones. The haze effect also known as light extinction dims the crescent by a large factor. At the low altitude where the most marginal crescents would be seen, only about 5% of the light from the crescent can penetrate the air, and 95 percent is lost because it is scattered away in other directions, even in the cleanest air. In a humid or polluted environment, much less than 1 percent of the light of a thin cresce
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