A2. Zones & Bands
The Zones–Bands–Zands (ZBS) Coordinate System
The ZBS system (Zones, Bands, and Zands) is a universal planetary surface division method designed for mapping, navigation, and administrative use on any roughly spherical astronomical body with a radius greater than 250 km. It is intended for use on planets, moons, and large asteroids that may become sites of human exploration and settlement.
The system divides the surface of a body into standardised, repeatable units that can be referenced consistently across scientific, operational, and settlement activities. It is designed to work on Mars, the Moon, and other bodies lacking natural geographic boundaries, and can also be applied to Earth for comparative purposes.
The ZBS system divides a planetary body’s surface into three primary components:
Zones – longitudinal divisions of 15° each.
Bands – latitudinal strips of 6° each between ±72°.
Zands (ZoneBands) – intersections of Zones and Bands, representing quasi-equal-area grid cells.
1. Zones - Zones divide the planet’s surface into 24 longitudinal slices, each 15° wide.
A–X: cover the 360° equatorial and mid-latitude belt (0–360° in 15° steps).
Extent: Zones run continuously from pole to pole.
Count: Always 24.
Provide a natural east–west indexing system.
Align with planetary timekeeping, enabling direct correspondence with “time zones.”
2. Bands - Bands are latitudinal strips, each 6° tall, spanning from 72°S to 72°N.
Provide a consistent north–south index.
Facilitate mapping of climate belts, daylight hours, and settlement zones.
Labelling: 24 Bands (b–y), with a–m in the northern hemisphere and n–z in the southern.
Extent: Total of 24 Bands cover the sub-polar belt.
Note – “Band a” is the northern polar region, and “Band z” is the southern polar region
3. Zands (a.k.a. ZoneBands) - A Zand is the intersection of one Zone and one Band. Provide manageable operational units (~200–300k km²). Nest cleanly into larger Quads and smaller Provinces.
Sub-polar Zands: Dimensions: 6° latitude × 15° longitude. Area ranges from ~145,000 km² (near 72° latitude) to ~318,000 km² (at equator). Total: 24 × 24 = 576.
Polar Zands: Above ±72°, each polar cap is divided into 24 wedges (15° wide, 18° tall). Each wedge = one Polar Zand. Total: 48 (24 north, 24 south).
Global Total: 624 Zands per body.
Benefits
Scalability: From Quads (~6,000,000 km²) to Zands (~200,000 km²) to Clicks (~1 km²).
Neutrality: Independent of national mapping traditions.
Predictability: Zones = 15° longitude, Bands = 6° latitude.
Integration with timekeeping: Longitudinal Zones double as planetary time zones.
Universality: Works on any spherical body >250 km radius (e.g. Mars, Ceres, Titan, etc.)
Applicability
The ZBS system has been applied to all settlement bodies in the Solar System, including: Mars, The Moon, Ceres, Europa, Ganymede, Callisto, Titan, Enceladus, Triton. Because these bodies lack large oceans or natural boundary markers, ZBS provides a neutral, consistent grid for exploration, navigation, and eventual settlement governance.