From 4af0d258ad58f310bc78788e0e25950eb1a546f6 Mon Sep 17 00:00:00 2001 From: Matt Birkholz Date: Sat, 16 Apr 2016 18:42:34 -0700 Subject: [PATCH] planetarium/: Tweak manual. --- src/planetarium/mit-scheme-planetarium.texi | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/src/planetarium/mit-scheme-planetarium.texi b/src/planetarium/mit-scheme-planetarium.texi index 91a554ead..70ee5eb33 100644 --- a/src/planetarium/mit-scheme-planetarium.texi +++ b/src/planetarium/mit-scheme-planetarium.texi @@ -57,7 +57,7 @@ position of the sun by drawing a face of Earth and shading its dark side. If an old X11 graphics device is all that is available, just the terminator is drawn. -To use, startup mit-scheme and enter these following two s-expressions +To use, startup mit-scheme and enter the following two s-expressions at the REPL prompt. @example @@ -72,8 +72,9 @@ Returns a new tellurion, a closure to which messages can be sent. @end deffn You can send a @code{turn-to} message to the tellurion, specifying a -latitude and longitude in degrees, by applying it to three arguments: -the symbol @code{turn-to} and the latitude and longitude (numbers). +latitude and longitude to place in the center of the drawing. To send +the message, apply the tellurion to three arguments: the symbol +@code{turn-to} and the latitude and longitude in degrees. For example, to center the globe on Fairbanks, Alaska, enter this: @example @@ -81,9 +82,11 @@ For example, to center the globe on Fairbanks, Alaska, enter this: @end example You can also have the tellurion draw the terminator as it would appear -at a particular time (other than the current time). Apply it to the symbol -@code{time-to} and a time, either a decoded time or an integer to be -interpreted as a universal time. +at a particular time. Apply it to the +symbol @code{time-to} and a time, either a decoded time or a universal +time (an integer). (See the reference manual's section ``Date and +Time''.) + @example (t 'TIME-TO (make-decoded-time 0 29 9 19 3 2016)) ;; a vernal equinox @end example -- 2.25.1