| Name | Description | Type | Package | Framework |
| Calendar | Approximations de quelques calculs astronomiques relatifs aux calendriers terrestres. | Class | org.geotools.nature | GeoTools |
| SeaWater | Sea water properties as a function of salinity, temperature and pressure. | Class | org.geotools.nature | GeoTools |
| SunRelativePosition | Class | org.geotools.nature | GeoTools | |