I can imagine time measurement by using reusable items like hourglass, hour candles might be to much efford to reproduce, beginning with finding your resources on your 9 year trip around the planet.
But how come they even found hourglasses? This all beginns in a safe harbour, a home, a world just like we know it.
Societey has to arise. Humans coming together in packs start specialising in theyr tasks. They build shelters, not everyone will be on the hunt or searching for food in an ever new place.
This won't work in a society that stared with a 9 Year-long days, which forces them to be on the run theyr entire live. Those humans would just live by what has grown over last day or even more in case they don't walk the perfect circle and miss places they had been beore, guess it's hard to be sure you visited this exact same place yesterday/9 years ago and you only walk in one direction, maybe you don't even come up with the idea you came back on the place you have started! They probably won't start building housings in any way since they would have to leave it faster then they can make theyr mind of how to build a well constructed long-time-home. The few who did this way felt comfortable started to learn about planting food and ... died when they had to learn this does not work at night.
Actually id say those who don't develop the instinct to keep on running become extinct. This way there is no save harbour to make some random experience about tools, making fire, grow food. And try to carry arround your rectangular stone while inventing the wheel, this would be to much a burden.
So this needs a safe harbour i sayed, but where should this be? Well, right there! Make the world slow down in rotation (not that hard people start falling off your planet by negative acceleration). How settled this world is before the happening and after is up to you. You are also up to how long this happening lies in past. Technical progress might had slowed down since people don't come together like they sued to to share theyr knowledge. 693
Also people have no time to spend on learning, they have to gather food in the new place they reach in theyr travel cycles, prepare for the travel in the next "day" or hourglass run. The hourglass will be kept by an elder time-keeper or a chief. This person is the metronome of a group tribe, like church bells used to be in some places.
Citys once beeing all over the planet had wearn away, ruins under piles of dirt are relics those new people can't remember anymore. They lost a lot of technological knowledge and might not even know, how or when the magical time articaft was crafted, which had to been turned 10 times before they had to travel 4 times the relic.
tl;dr People measure time in a reusable way theyr technological advance allows them, like hour glases. People have been on the planet since forever, but the planet changed, it slowed down spinning thousnads of years ago and societeys dacyed. Who is left are those people who early enough started to travel and follow the sun. They have not have found any time to develop on new technologies or anything since theyr all-days destiny is to march every day, following the never setting sun.
following my OLD POST i made but was criticized, so i rewrote it, just did not wanted to miss a point.
I think this doe's not work since this entire Planet leaves no space to stay for long enough humans would evolve the way they did (depends on the planets sice) but imagine peope in the very first stadium like wild animals in a herd.
They would live by what has grown over last few years while they travled and what lives there when they appear. They probably won't start building housings in any way since they would have to leave it faster then they can make theyr mind of how to build a well constructed long-time-home. The few who did this way felt comfortable started to learn about planting food and died when they had to learn this does not work at night.
Actually id say those who don't develop the instinct to keep on running become extinct. This way there is no save harbour to make some random experience about tools, making fire, grow food. And try to carry arround your rectangular stone while inventing the wheel, this would be to much a burden.
As long as there is no safe harbour for your people to develop into this stadium there will be no evolution from herds to social structure we have. And without this, noone will be like: let's meet next weekend, i have some busy days, can't wait for friday. 121