Hi Fiona,
what a lovely book – I haven’t seen it in a while, but when I checked the author’s site I recognised it.
http://www.bobcrelin.com/fotmpeek.html
There is a full teacher guide to it here.
Just note that phases of the Moon are not included in the Irish curriculum until Junior Cycle – for primary children should be aware of the Moon, but even in 5th/6th class the emphasis is
• recognise that the Earth, its moon, the sun, other planets and their satellites are separate bodies and are parts of the solar system
• develop a simple understanding of the interrelationship of these bodies, including day and night and seasonal movements
So treat the changing appearance of the Moon as shadows of itself. Misunderstandings of the phases of the Moon are common and discussion around them can be very useful for children to think of the Earth and Moon as objects in space, lit by the Sun, and day and night on the Moon causes it to change appearance for us.