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Therefore the sphere , whose greatest circle is ABGD , is four-times the cone whose vertex is point A and whose base is the circle about diameter BD perpendicular to AG . Some ammunition had been blown up — not removed — but the trophies of war were a few Quaker guns , logs of about the diameter of ordinary cannon , mounted on wheels of wagons and pointed in the most threatening manner towards us . The mesoscopic scale is of the order of the diameter of the dendrite envelopes , which is large compared to the interdendritic spacings . The Park is only two miles square , and the largest of its many fine trees is the General Grant , so named before the date of my first visit , twenty-eight years ago , and said to be the largest tree in the world , though above the craggy bulging base the diameter is less than thirty feet . The diameter of the Sun is 100 times larger than the diameter of the Earth .