How long is the longest day of the year?
When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Sign up forhealth tips to live a long and happy life  On Monday, June 21, the Northern Hemisphere will experience its longest day of the year. Also known as the Summer Solstice, June 21 will mark the astronomical start of summer and is a pagan celebration. The Summer Solstice falls on Monday, June 21 and the UK will enjoy 16 hours and 38 minutes of daylight. On Monday, the Sun will rise at 4.52am BST and set at 9.26pm BST. This marks the astronomical start of summer, and days will slowly grow shorter for the rest of the year. Read More: Summer Solstice rituals and celebration ideas - five ways to celebrate