Why is the moon phase important for fishing?

Moon phases dictate ocean tidal strength through gravitational alignment. During a New Moon or Full Moon (Spring Tides), maximum water movement occurs, which disperses baitfish and triggers aggressive feeding in predatory species like snapper, barramundi, and kingfish.

What is the difference between a Lunar Calendar and a Roman/Solar Calendar?

A Lunar Calendar is based on the moon's synodic cycle of 29.53 days per month (354.36 days per year), whereas the Roman/Gregorian Solar Calendar tracks the Earth's orbit around the Sun (365.24 days). This 11-day annual difference causes lunar months to shift through the seasons over a 33-year cycle.

What are Spring Tides and Neap Tides?

Spring Tides occur twice a month during Full Moon and New Moon when the Sun and Moon align, producing the greatest tidal difference (highest highs and lowest lows). Neap Tides occur during the First and Third Quarter moons when gravitational forces pull at 90-degree angles, producing weak tidal variation.

Islamic (Hijri) Lunar Converter

Astronomy, Tides & Solunar Fishing

Moon Phase & Solunar Fishing Calculator

Determine the exact moon phase, illumination percentage, solunar fish feeding score, and tidal currents for any date in Australia or worldwide.

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Choose any past, present, or future date to compute the exact synodic phase and solunar index.

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Solunar Theory, Tides & Astronomy

How the Moon Drives Fishing Activity and Ocean Tides

For centuries, commercial fishers, indigenous navigators, and recreational anglers have used the lunar cycle to forecast fish feeding behavior. The underlying science combines gravitational tidal forces with light levels.

Spring vs Neap Tides

Spring Tides (New & Full Moon) create high water displacement, flushing nutrients through estuaries and gutters. Neap Tides (1st & 3rd Quarter) have minimal water movement, causing fish to hold tighter to cover.

Major & Minor Solunar Periods

Fish experience peak feeding during Major Periods (when the Moon is directly overhead or underfoot, approx. 2 hours) and Minor Periods (Moonrise and Moonset, approx. 1 hour).

Lunar vs Solar Calendars

A true Lunar Year consists of 12 synodic cycles totaling 354.36 days — roughly 11 days shorter than the Roman/Gregorian solar year (365.25 days).

Lunar Calendar vs Roman (Gregorian) Solar Calendar

Comparison between the astronomical lunar cycle and standard civil calendars:

Feature	Lunar Calendar (e.g. Hijri / Solunar)	Roman / Gregorian Solar Calendar
Basis	Moon phases (Synodic month: 29.53 days)	Earth's orbit around the Sun (365.2425 days)
Year Length	354 or 355 days (12 lunar months)	365 days (366 in leap years)
Annual Drift	Shifts backward ~10.88 days per solar year	Locked to seasons & equinoxes
Full Cycle Rotation	Completes a full seasonal loop every ~33 years	Static four-season alignment

Frequently Asked Questions

What is the best moon phase to go fishing in Australia?

The 3 to 4 days leading up to and immediately following both the New Moon and Full Moon consistently produce the highest catch rates. The vigorous Spring Tide currents stimulate active feeding in estuary, reef, and pelagic species.

How long is a synodic lunar month?

A synodic month (the time between one New Moon and the next New Moon) is exactly 29 days, 12 hours, 44 minutes, and 2.8 seconds (approximately 29.53 days).