Heat, television and the morning a city woke up to watch a race already half over.
Six in the morning
The start time was set by the forecast and confirmed by a broadcaster on the other side of the world. The athletes ran through a sleeping city and finished into a crowd that had been queuing since four.
What it changed
Every championship marathon since has started before nine. The race that was moved for television turned out to be the race that was best for the runners.