“observability”

Maps recent iNaturalist sightings of a species you search for.

Predicts upcoming Animal Crossing turnip sell prices from the prices you have seen so far in the week.

Tests independence in a contingency table of up to five rows and columns using Pearson's statistic.

Runs chi-square tests of independence or fit and returns the p-value.

Sky resources and events guides for astronomy outreach.

Shows wave fronts from a moving source or observer and the resulting frequency shift.

Animates the apparent daily path of a star for an observer at a chosen latitude.