Yes, I use a portable sundial to become more aware of the positions/orbit of the sun and the possibility of measuring time with it. I also rely on my apple watch which I have in sun position mode.
I am interested in the passing of time in a psychological sense, 'when having fun', in meditation, after meditation, in flow state.
https://mediaecologiesresonate.wordpress.com/2008/06/28/on-b...
When I was younger I experimented with polyphasic sleep, 6x23 minutes of sleep for a yar. Whenever I'm napping I sync the napping time up to the sun position, with current local astronomical midnight as 0 (1.37 am), and the next phases at 5.37 (1), 9.37 (2), 13.37 (3), 17.37 (4) and 21.37 (5). I'm not doing the 6x23 minute schedule for a long period due to health and social concerns, only for occasional napping, but use it also for prayer or meditation anchors, similar as to muslims or christian monastaries schedule their prayers. About the potential issues with polyphasic sleeping (which I have once maintained a year):
https://www.sciencedirect.com/science/article/pii/S235272182...