Philip's Sun Observing Guide
Pam Spence, discusses how to observe the Sun, how to analyse what you see, eclipses, imaging the sun and what the professionals do.

The Cambridge Encyclopedia of the Sun
Lang, fdiscusses everything that there is about the Sun, how it works, what its made from, the surface, magnetics and the solarwind and how it interacts with the Earth.

Glorious Eclipses
Brunier & Luminet, a large format hardback covering all the great solar eclipses in the past and ones to come in the future in great detail. 

Easy To Make Wooden Sundials, Instructions and Plans for 5 Projects
Stoneman, This guide to making wooden sundials gently leads beginning diallists into sundial lore and construction. Novice craftsmen who can wield a saw, wood-burning pen, matte knife, sandpaper and a few other simple tools can make five different kinds of sundials; plans are flexible and allow for embellishment, alteration, variety of materials. Precalculated templates can be removed from the book and carbon-paper-transferred to wood

Sundials, History, Theory and Practice
Rohr, Excellent book on theory and existing dials around the world. Calculations for building your own sundial can be complicated unless you were good at math. College level math is adequate. All types of sundials are explained well. High recommendation

Sundials, Their Construction And Use
Mayall, Clearly written, easy-to-follow instructions for constructing a sundial on almost any surface and in virtually any position, with information on selecting appropriate materials, making Standard Time dials, and laying out hour lines. Dial furniture, portable sundials, constructing a heliochronometer, and other subjects also covered. Over 60 illustrations

Sundials, Their Theory And Construction
Waugh, This fascinating approach to sundials offers a rigorous appraisal of the science of sundials, including mathematical treatment and pertinent astronomical background. It also provides a nontechnical treatment simple enough that several of the dials can be built by children. 106 illustrations.