Photosynthesis: Chemical process by which plants containing chlorophyll use sunlight to manufacture their own food by converting carbon dioxide and water to carbohydrates, releasing oxygen as a by-product. Respiration: The process in which oxygen is used to break down organic compounds into carbon dioxide and water.
The Perseid meteor shower, one of the brighter meteor showers of the year, occurs every year between July 17 and August 24. The shower tends to peak around August 9-13. The best time to view the Perseids, and most other meteor showers, is when the sky is the darkest.
When is the best time to see a Perseid? The best time to spot a Perseid between August 9-15 is from 1am BST until the onset of dawn twilight. Peak rates of 150 meteors per hour are predicted for 2016 but this is the showerâs Zenithal Hourly Rate (ZHR) figure.