Lunker

Know when the fish will bite. Lunker scores every day 0–100 using the moon's transit, distance, and alignment with the sun — the proven solunar formula.

Lunker tells you when to fish.

Every day, the moon's position drives fish activity. Lunker scores every day from 0 to 100 using the proven solunar formula developed by John Alden Knight in 1926 — combining the moon's overhead and underfoot transit, lunar distance, and alignment with sunrise and sunset.

WHAT YOU GET

• Four daily feeding windows Two major periods (2 hours each, when the moon is overhead or underfoot) and two minor periods (1 hour each, at moonrise and moonset).

• Day rating, 0–100 Excellent, Good, Average, or Poor — based on moon phase, lunar distance (closer to perigee = better), and sun/moon alignment.

• Monthly calendar See the entire month at a glance. Plan trips around the best days.

• Live "Active Now" indicator Real-time tracker showing which feeding window is currently open and how much time remains.

• Moon details Phase, illumination, moonrise/moonset/transit times, lunar distance, supermoon alerts.

• Multiple locations Save your favorite spots. Lunker calculates accurate times for each one.

• Built for anglers, not astronomers Plain, fast, focused on the bite.

WHY SOLUNAR WORKS

The moon's gravity drives the tides — and fish respond to the same gravitational pull. Activity peaks four times each day, with the strongest peaks during new and full moons when the sun's gravity stacks with the moon's. Lunker uses precise lunar calculations to predict these windows down to the minute for your exact location.

PRECISE ASTRONOMY

• Jean Meeus astronomical algorithms for lunar position, transit, and phases • NOAA solar calculator formulas for sunrise, sunset, and alignment • Accurate perigee/apogee detection for supermoon alerts

WHO IT'S FOR

• Bass anglers tracking the bite • Freshwater fishermen planning trips • Saltwater fishermen pairing solunar with tides • Anyone tired of guessing when to launch the boat

Tight lines.