#====================
# Figure 9.10.R.
# Parallax of a star.
#====================
x=c(1,12,12,1,12,12);
y=c(2,2,3,2,1,2);
par(lwd=2,cex=2,pin=c(4,2.5));
plot(x,y,type="l",xlim=c(-1,16),axes=FALSE,ann=FALSE);
text(5,2.2,expression(theta));
text(13.5,2,"Sun");
text(13.9,3,"Earth");
text(-0.5,2,"star");