# A Note on the Passing Time of the Spherical Kepler Problem

## TL;DR

This paper reviews known facts about the Kepler problem's time parametrizations and projection correspondences in Euclidean and spherical geometries, providing insights into their mathematical structure.

## Contribution

It compiles and clarifies existing knowledge on the Kepler problem's time parametrizations and projections in different geometric settings.

## Key findings

- Summarizes key properties of Kepler problem projections
- Details time parametrizations in Euclidean and spherical contexts
- Provides mathematical insights into Kepler problem structures

## Abstract

In this note we collect some known facts concerning central projection correspondances and time parametrizations of Kepler problems in Euclidean spaces and on Spheres.