Field notes
Clear explanations of the astronomy and ocean science behind tide, moon, sun, and planetary timepieces.
OrbiKron /
Why OrbiKron shows planets around the Sun rather than zodiac signs: the differences in viewpoint, retrograde motion, and purpose between an astronomical orrery and an astrology chart.
Read guideNautiKron /
Why Cook Inlet’s huge tidal range, shallow water, and tidal bores challenge ordinary tide clocks, and how NautiKron calculates the local tide.
Read guideOrbiKron /
Understand heliocentric planet positions, orbital longitude, and how an electronic orrery turns current ephemeris data into light.
Read guideOrbiKron /
An introduction to mechanical and electronic orreries, their history, and the compromises involved in displaying the solar system.
Read guideNautiKron /
Learn how mechanical and data-driven tide clocks estimate the rise and fall of the sea, and where their predictions differ.
Read guideNautiKron /
Traditional tide clocks assume a repeating semidiurnal cycle. Learn why local harmonics and subordinate stations make real tides more complex.
Read guideNautiKron /
Why Puget Sound needs a location-aware tide clock, how its mixed tides vary by port, and what to look for in a useful display.
Read guide
