Aspects of this topic are discussed in the following places at Britannica.
...the Moon is near perigee, observers along the path of the Moon’s dark inner shadow (umbra) see a total eclipse. If the Moon is near apogee, it does not quite cover the Sun; the resulting eclipse is annular, and observers can see a thin ring of the solar disk around the Moon’s silhouette. (See animation.)
...eclipse of the Sun occurs at this time, the Moon’s disk passing over the Sun’s disk cannot cover it completely but will leave the rim of the Sun visible all around it. Such an eclipse is said to be annular. Total and annular eclipses are called central.
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