Decades: 770s - 780s - 790s - 800s - 810s - 820s - 830s - 840s - 850s - 860s - 870s
Years: 820 821 822 823 824 825 826 827 828 829
Important people:
... result from the light that is not absorbed by the pigment molecules. The typical overall chemical reaction of photosynthesis is: 6H2O + 6CO2 + light → C6H12O6 ...