My book told me to get out at 7.30pm to see Mercury. The arrow shows Jupiter. Mercury was in the circle but the sky was to bright there for it to stand out in the photo. It has led me to find out what elongation means. It turns out that it refers to an angle. It is the biggest angle between the Sun and the planet as seen from Earth, so I suppose it must make it seem furthest from the Sun and in Mercury's case, makes it easier to see.
