📄️ Overview
Event Filter Evaluation
📄️ Filter Script Objects
When creating a filter expression, the scripting objects you can use are linked to the planets, apogees, nodes and zodiac signs associated with the chosen ephemeris.
📄️ Body Object Properties
The properties of scripting objects that correspond with celestial bodies are used to determine the positions and speeds of planets, apogees, and nodes. You can access a specific property by adding the property name after the object name, separated by a full stop (period). For example, if you want the longitude of Venus, you would enter `Venus.Longitude`.
📄️ Comparison Operators
Comparison operators are symbols used to compare two values, known as operands. These operators evaluate to either true or false depending on the relationship between the values. When writing filter expressions, you'll likely need the following four comparison operators:
📄️ Logical Operators
Logical And Operator
📄️ Operator Precedence
When a filter expression contains more than one type of operator, the operator precedence determines the order that the components of the overall expression will be evaluated in.
📄️ Filter Script Functions
Filter expressions can quickly become fairly complex and tedious, especially when longitudinal ranges span 0°. Functions are our saviours in this regard.