Python docs: support documentation of enumerated types.

source/python/README.md

@@ -11,6 +11,12 @@
 
 **Represents the geographic location of an observer on the surface of the Earth.**
 
+| Type | Parameter | Description |
+| --- | --- | --- |
+| `float` | `latitude` | Geographic latitude in degrees north of the equator. |
+| `float` | `longitude` | Geographic longitude in degrees east of the prime meridian at Greenwich, England. |
+| `float` | `height` | Elevation above sea level in meters. |
+
 
 
 
@@ -21,6 +27,10 @@
 
 **Represents a date and time used for performing astronomy calculations.**
 
+All calculations performed by Astronomy Engine are based on
+dates and times represented by `Time` objects.
+
+
 | Type | Parameter | Description |
 | --- | --- | --- |
 | `float` | `ut` | UT1/UTC number of days since noon on January 1, 2000. See the `ut` attribute of this class for more details. |
@@ -32,6 +42,95 @@
 
 
 
+---
+
+<a name="enumerations"></a>
+## Enumerated Types
+
+
+---
+
+<a name="ApsisKind"></a>
+### ApsisKind
+
+**Represents whether a satellite is at a closest or farthest point in its orbit.**
+
+An apsis is a point in a satellite's orbit that is closest to,
+or farthest from, the body it orbits (its primary).
+`ApsisKind` is an enumerated type that indicates which of these
+two cases applies to a particular apsis event.
+
+
+| Value | Description |
+| --- | --- |
+| `Pericenter` | The satellite is at its closest point to its primary. |
+| `Apocenter` | The satellite is at its farthest point from its primary. |
+| `Invalid` | A placeholder for an undefined, unknown, or invalid apsis. |
+
+
+
+---
+
+<a name="Body"></a>
+### Body
+
+**The celestial bodies supported by Astronomy Engine calculations.**
+
+| Value | Description |
+| --- | --- |
+| `Invalid` | An unknown, invalid, or undefined celestial body. |
+| `Mercury` | The planet Mercury. |
+| `Venus` | The planet Venus. |
+| `Earth` | The planet Earth. |
+| `Mars` | The planet Mars. |
+| `Jupiter` | The planet Jupiter. |
+| `Saturn` | The planet Saturn. |
+| `Uranus` | The planet Uranus. |
+| `Neptune` | The planet Neptune. |
+| `Pluto` | The planet Pluto. |
+| `Sun` | The Sun. |
+| `Moon` | The Earth's moon. |
+
+
+
+---
+
+<a name="Direction"></a>
+### Direction
+
+**Indicates whether a body is rising above or setting below the horizon.**
+
+Specifies the direction of a rising or setting event for a body.
+For example, `Direction.Rise` is used to find sunrise times,
+and `Direction.Set` is used to find sunset times.
+
+
+| Value | Description |
+| --- | --- |
+| `Rise` | First appearance of a body as it rises above the horizon. |
+| `Set` | Last appearance of a body as it sinks below the horizon. |
+
+
+
+---
+
+<a name="Refraction"></a>
+### Refraction
+
+**Selects if/how to correct for atmospheric refraction.**
+
+Some functions allow enabling or disabling atmospheric refraction
+for the calculated apparent position of a celestial body
+as seen by an observer on the surface of the Earth.
+
+
+| Value | Description |
+| --- | --- |
+| `Airless` | No atmospheric refraction correction. |
+| `Normal` | Recommended correction for standard atmospheric refraction. |
+| `JplHorizons` | Used only for compatibility testing with JPL Horizons online tool. |
+
+
 ---
 
 <a name="functions"></a>
@@ -45,6 +144,10 @@
 
 **Finds the Body enumeration value, given the name of a body.**
 
+>>> astronomy.BodyCode('Mars')
+<Body.Mars: 3>
+
+
 | Type | Parameter | Description |
 | --- | --- | --- |
 | `str` | `name` | The common English name of a supported celestial body. |
@@ -59,6 +162,16 @@
 
 **Calculates the geocentric position of the Moon at a given time.**
 
+Given a time of observation, calculates the Moon's position as a vector.
+The vector gives the location of the Moon's center relative to the Earth's center
+with x-, y-, and z-components measured in astronomical units.
+This algorithm is based on Nautical Almanac Office's *Improved Lunar Ephemeris* of 1954,
+which in turn derives from E. W. Brown's lunar theories from the early twentieth century.
+It is adapted from Turbo Pascal code from the book
+[Astronomy on the Personal Computer](https://www.springer.com/us/book/9783540672210)
+by Montenbruck and Pfleger.
+
+
 | Type | Parameter | Description |
 | --- | --- | --- |
 | [`Time`](#Time) | `time` | The date and time for which to calculate the Moon's position. |