Here are the main events during Prince Harry and Meghan Markle's wedding day, and their timings.
0900 - Members of the public who have been invited to watch the wedding day from the grounds of Windsor Castle begin to arrive.
0930-1100 - Wedding guests arrive at the Castle's famous Round Tower by coach and enter the chapel through the South Door and take their seats.
1120 - Members of the royal family begin to arrive and enter via the Galilee Porch, some on foot and others by car.
1145 - Possibly around this time Harry and his brother the Duke of Cambridge arrive at the Chapel's West Steps, probably on foot walking past the thousands of spectators invited into the grounds of the castle. The moment will give Harry the chance to acknowledge the 200 representatives from charities he is associated with gathered in the Horseshoe Cloister at the bottom of the steps.
1155-1159 Following protocol, the Queen will be the last member of the royal family to arrive for the wedding service.
1159 - Ms Markle arrives at the Chapel's West Steps by car, from her overnight accommodation, with some of her bridesmaids and pageboys. She will start her journey, which will take her past some of the crowds in the Long Walk, with her mother Doria Ragland - but when the car stops at the castle her mother will exchange places with her bridesmaids and pageboys. Ms Ragland will enter the chapel by the Galilee Porch and at some point Meghan's father Thomas Markle will have arrived at the same entrance. He will make his way to the West Door where he will meet his daughter before the ceremony begins.
1200 - Service starts.
1300 - Service ends and the newlyweds emerge at the West Steps of the Chapel. They will be waved off on their carriage procession through Windsor by members of both families. The congregation will file out of the chapel to see the newlyweds leave before heading to St George's Hall for the lunchtime reception hosted by the Queen.
1305 - Possibly around this time the carriage procession through the streets of Windsor begins, taking 25 minutes.
1900 - Bride and groom depart Windsor Castle for the evening reception at Frogmore House, hosted by the Prince of Wales.