A two-minute silence has marked the centenary of the start of the bloodiest battle in British military history, BBC reported.
People across Scotland fell silent at 07:28 am, marking the exact moment the first wave of men went over the top in the Battle of the Somme.
It brought to an end an overnight vigil by members of the armed forces at the National War Memorial in Edinburgh.
First Minister Nicola Sturgeon will join members of the Royal Family at a remembrance service in France later.
A ceremony has been held at the Lochnagar crater which was created by an explosion at the start of the battle in La Boiselle, France.
And wreathes have been laid at a memorial to the 15th and 16th battalions of the Royal Scots in the French village of Contalmaison.
In Glasgow two paving stones will be unveiled honouring local soldiers who received the Victoria Cross for bravery at the Somme.
More than a million men were wounded or killed in the 141-day battle, the most devastating encounter of World War One.
Commemorations began at Scotland's National War Memorial on Thursday evening when hundreds of people joined military personnel, veterans and descendents at an overnight vigil.
Prayers were said before candles were taken inside the war memorial and placed on a casket containing the original Roll of Honour for the fallen of the Great War.
The candles were guarded overnight by representatives from units including the Wrens, the Royal Navy and several Scottish Army regiments, standing by the casket with their heads bowed.
A two-minute silence, which began with the firing of the One O'Clock Gun, ended at 07:30 when Lt Col Alan Hamilton sounded a whistle used by his great uncle at the Somme.
He said his relative, Robert Hamilton, a member of the Royal Artillery attached to one of the Scottish units, blew the whistle at 07:30 am to take his men over the top.