I had it later. I think sometimes it takes so long it might as well skip a day. Or two. But it isn't really skipping a day, just, being very slow.
Unrelated, again... what are the body types that have a population boost? ELW's are the obvious answer. Terraformable water worlds, too. Do non-terraformable water worlds have it? Do terraformable HMC's have it, too?
Still no pop tick. Had double tick the evening of 11/06, then during the weekly update on 12/06, then the morning of 14/06, now nothing since then.
So it's basically one population tick for the last 4 days for me, when it was daily before.
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What i know about population:
The planetary relation - from my observations - is Earth Like > Water World > other. I have not yet figured out relevant differences between HMC, rocky, ice and rocky/ice, but i haven't investigated thoroughly.
Regarding population boosts: it isn't only planet related, but also economy related. e.g. I have watched a 3m pop tick in Wregoe SJ-J B50-6 on the third day after building a T3 planetary starport. This changed to 5m when the economy of the port changed to High Tech (Edit: i did not observe changes to pop rate increase on the 4th day with other stations, but constant pop changes since the third day). This is in line with the observation that agricultural systems have higher population. My current assumption regarding economy boost is agri > high tech > industrial, refinery > extraction.
Also, it is port related. T3 > T1 planetary port > T2 port > outpost. Have not seen any significant differences between the T3 planetary starport and the T3 orbitals. Both give mid-doubledigit-millions (edit: with population ticks in the low-mid single digit values). If anything, my impression was that T3 orbitals are more powerful. Therefore: make use of planetary T1 ports. These give significant population boosts compared to outposts and Coriolis. e.g. one of my squad mates built 2 T1 ports and a Coriolis on and around an ice world in Col 285 Sector TY-H c10-7. The system is industrial and has a population of 7.4 million.
Regarding station population: Population is station specific, as can be seen by the supply numbers (Hydrogen Fuel is the best indicator). It is roughly a square root relation. Massive increases in a system's population do, however, hardly affect other stations than the station where the population increase is happening. In my Wregoe KP-E c25-11 system the Refinery "Victoria Wolf Steel" saw it's Steel production increase from around 128k tons to around 143k tons over the last 1.5 weeks. While the population increased from 500k to 118m. This is negligible and can be fully explained with the additional dev and wealth from Orbis + commercial outpost + tourist installation + T1 planetary port + security station.
Edit: all observed changes were for systems with decent standard of living, with low to mid double digit system wide values)