Taiwan travel for Consequently, any investigation of ancient comets must bear in mind that relatively few records have been preserved. As Ramsey and Licht highlight, The vast majority of comets have come and gone without leaving a trace. FIG Comet Ikeya-Zhang on March which now has an orbital period of years, visited the inner solar system in and Image credit The High School Astronomy Class at Alssundgymnasiet S?nderborg, Denmark, www.astronomyags. dk. Ancient Views of Comets The inluential Greek philosopher Aristotle believed that comets were merely meteorological phenomena, the product of the earth’s warm exhalations rising to the highest part of the sphere of air and indeed to the border of the sphere of ire, where they ignited. Thereafter they were transported around the region of the upper air. Taiwan travel 2016.