Because of the size of Sputnik 2 and its attached Blok A, the spacecraft was easy to track optically. In its last orbits, the combined body tumbled end over end, flashing brightly before it was incinerated over the north Atlantic after circling the Earth 2,370 times over the course of 162 days. The spacecraft reentered the Earth's atmosphere on 14 April 1958, at approximately 0200 hrs, on a line that stretched from New York to the Amazon. Its track was plotted by British ships and three "Moon Watch Observations", from New York. It was said to be glowing and did not develop a tail until it was at latitudes south of 20° North. Estimates put the average length of the tail at about 50 nautical miles (93 km; 58 mi).