Physical geography
Kant tried to reconcile the division of sense and reason by stressing moral rationalism grounded on aesthetic experience of nature as "order, harmony, and unity". For knowledge, Kant distinguished phenomena ("sensible" world) and noumena ("intelligible" world), and he asserted "all phenomena are perceived in the relations of space and time." Drawing a line between "rational science" and "empirical science", Kant regarded Physical geography—associating with space—as natural science. During his tenure in Königsberg, Kant offered lectures on physical geography since 1756 and published the lecture notes "Physische Geographie" in 1801. However, Kant's involvement in travel and geographical research is fairly limited. Kant's work on empirical and rational science influence Humboldt and at smaller extent Ritter. Manfred Büttner asserted that is "Kantian emancipation of geography from theology."