Astronomer Robert Purrington believes the ridges at Poverty Point were geometrically, rather than astronomically, aligned. Despite the differences between voyagers, beliefs concerning the afterlife are astronomically reliant on religious ideologies. Hence the resulting code tends to be astronomically large and very inefficient. The lingering effects of this difference could perhaps be calculated and observed astronomically. Cyclostratigraphy is the study of astronomically forced climate cycles within sedimentary successions. "Foamhenge" is designed to match Stonehenge, with similarly sized pieces oriented in astronomically equivalent coordinates. Even by the standards of the day it was an astronomically expensive piece. Most Greek temples were oriented astronomically. The earliest generations of stars have not yet been observed astronomically. By fortune in 1820, he made the acquaintance of the astronomically inclined Sir Thomas Brisbane. A capstone lies on top of the five slabs, which are astronomically aligned. Such an astronomically precise feature is seen only at this location on the island. Some Greek temples appear to have been oriented astronomically. Sometimes people refer to numbers as being "astronomically large". In Boltzmann brain scenarios, the ratio of Boltzmann brains to "normal observers" is astronomically large.