Pope Francis may visit Fatima to celebrate the centenary in 2017.
98 years ago today, Our Lady appeared to Lucia, Jacinta and Francisco. It's not a random event that she did so on May 13th 1917. Nor is it an arbitrary coincidence that the Miracle of the Sun happened on October 13th, during the month that is dedicated to the Most Holy Rosary. Our Lady gave St Dominic the Rosary in the 13th century.
A fact is that the letter 'm' is the 13th letter of the alphabet. This just might be by chance, or it could owe to England's Catholic days when the letter 'm' for Mary was placed at number 13 in the series of letters because it honoured Our Lady, the 13th witness to the descent of the Holy Spirit.
Over at the Herald, I have a post on Our Lady's method of marking her presence on our earthly calendars. It's a system that uses a certain number and one day a month. The number is 13 and the date is the 13th of every month.