What long-period comets with orbital periods >250 years cause detectable meteor showers on Earth? Low-light video cameras are used to track the motion of +4 ?5 magnitude meteors in our atmosphere by triangulation and calculate meteoroid orbit space. In recent years, CAMS (Cameras for Allsky Meteor Surveillance) low-light camera network was greatly expanded and, together other networks, now has ...

[NB: This report was scanned and reformatted on 13 March 2008. The only changes have been to preserve internal consistency and to correct typographical errors. HK. The original was an archive report deposited at Environmental Archaeology Unit, Carlisle Archaeology Unit and Ancient Monuments Laboratory, and allocated post hoc as Reports from the Environmental Archaeology Unit, York 88/17.] * Car...