1. The solar constant includes all types of solar radiation, not just the visible light.

2. The solar constant water heater is a novel solar water heater which can measure up to the requirements on energy saving and environment-friendliness and is suitable for promotion and popularization.

3. The spacecraft results also confirm that ground-based observations can indirectly tell us about fluctuations in the solar constant.

4. The various uncertainty items are calculated to compose the total measurement uncertainty and to get the expanded uncertainty. The uncertainty of DCICAR under one solar constant is 0.11%.

5. Changes of the global temperature induced by the changes ice and snow areas, solar constant, surface albedo, carbon dioxide and aerosol have been simulated with a one–dimensional energy balance model.