Based on a quick reading of the TFES website there is a notion of Universal Gravity [1] which at first glance would seem to orient a simple horizon indicator in

Based on a quick reading of the TFES website there is a notion of Universal Gravity [1] which at first glance would seem to orient a simple horizon indicator in the right direction. There are also some articles on perspective from their POV which are easy to find. Their ideas of perspective are novel. [1] http://www.theflatearthsociety.org/tiki/tiki-index.php?page=Gravity http://www.theflatearthsociety.org/tiki/tiki-index.php?page=...