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--- traveller:roll20 [2020/10/24 15:48] – created sam
+++ traveller:roll20 [2020/10/24 22:35] – sam
@@ Line 1: / Line 1: @@
+{{ :traveller:traveller-heading.png?nolink&800 |}}
 ====== Roll20 Scripts ======
 ===== Physics [!physics] =====
-The //Physics// scripts are designed to provide aid in calculating basic things such as information on planets, or plotting travel times.
+The //Physics// script is designed to provide aid in calculating basic things such as information on planets, or plotting travel times. It's not specifically tied to //Traveller//, but was written with that game in mind. As with my other scripts, it is available on [[https://github.com/samuelpenn/rpg/blob/master/roll20/traveller/physics.js|GitHub]].
 ==== planet ====
+Can be used to display some basic statistics about a planet.
+{{ :traveller:almost-earth.png?nolink&200|}}
+The simplest command can be used to calculate statistics for a planet.
 <code>
-!physics planet 5000km 5.5
+!physics planet 6400 5.5
 </code>
+Displays statistics on a planet with a radius of 6400km, and a density of 5.5g/cm³. It will display the planet's mass, escape velocity and surface gravity.
+You don't have to specify the full command. You can use !phy instead of !physics. You can also specify the first letters of the command word.
+<code>
+!phy planet 6400 5.5
+!phy plan 6400 5.5
+!phy p 6400 5.5
+</code>
+{{ :traveller:earth.png?nolink&200|}}
+You can specify different units, for example you can use 'e' for Earth, 'j' for Jupiter or 'sol' for Sol. You can also specify, m (metres), km (kilometres), mkm (millions of kilometres) or au (astronomical units).
+<code>
+!physics planet 1e 1e
+</code>
+=== Orbits ===
+{{ :traveller:earth-orbit.png?nolink&200|}}
+Another option is to specify an orbit. If a third parameter is specified, then it is the distance to an orbit, which by default is from the centre of the planet. To specify a 7,000km orbit around a 6,400km radius planet you would use:
+<code>
+!physics planet 6400km 5.5 7000km
+</code>
+Alternatively, you can specify an orbit as an altitude by using +<altitude>.
+<code>
+!physics planet 6400km 5.5 +400km
+</code>
+=== Solar Orbits ===
+{{ :traveller:solar-orbit.png?nolink&200|}}
+You can also specify solar orbits, simply by using larger numbers.
+<code>
+!physics planet 1sol 1sol 1au
+!physics planet 2sol 1.5sol 3au
+!physics planet 5j 1.5j 1mkm
+</code>