I'm planning to create a sundial in Ghana (10° 28.852', 0° 26.032') in July 2014. I will stay there for about 3 weeks. Do I need to adjust the numbers anywhere in these 3 weeks? I know the shadow's path changes through the year, but how much does it change? Is the change significant for a sundial?
(btw, is this the correct site to ask or should I use the astronomy site?)