Places Without Time Zones: The ISS, Open Ocean, and Unzoned Spots

Time zones were designed for a world of nations, cities, and railway connections. But not everywhere on Earth, or above it, fits neatly into this framework. The open ocean, the International Space Station, uninhabited territories, and disputed lands all present situations where the standard time zone system breaks down or simply doesn't apply.

Introduction

These "unzoned" places reveal the limits of our timekeeping system and force creative solutions. From astronauts using UTC to ships switching zones mid-voyage, the human need to know "what time is it?" persists even where no time zone officially exists.

The International Space Station

• Orbit: ~408 km altitude, 90-minute orbital period
• Sunrises per Day: 16
• Time Zone Used: UTC (Coordinated Universal Time)
• Crew Schedule: Wake at 06:00 UTC, sleep at 21:30 UTC

The International Space Station orbits Earth every 90 minutes, experiencing 16 sunrises and 16 sunsets per day. Using any Earth-based time zone would be meaningless, as the station passes through all of them continuously. Instead, the ISS uses UTC, the same standard used by aviation and international shipping.

Astronauts maintain a strict schedule based on UTC: wake-up at 06:00, work from 08:00 to 19:30 with breaks, and lights-out at 21:30. This schedule was chosen as a compromise between the working hours of the two main mission control centers in Houston (UTC-6) and Moscow (UTC+3).

The Open Ocean

• Time Zone Convention: Nautical time zones based on longitude
• Ship Practice: Captain sets the clock; usually adjusts 1 hour per 15° longitude
• International Waters: No government jurisdiction over time
• Shipping: Uses UTC for navigation; local time for crew schedules

International waters have no official time zones. By convention, ships use "nautical time zones" that follow the theoretical 15-degree bands of longitude, adjusting the clock by one hour each time the ship crosses a zone boundary. But the captain has discretion over when to make the adjustment and can choose practical times rather than exact meridian crossings.

Large commercial ships typically use UTC (also called "Zulu time") for all navigation and communication, while maintaining a separate "ship's time" for crew schedules. On a transatlantic voyage, the crew might adjust ship's time by one hour every night or two, creating a gradual shift rather than an abrupt jump.

Uninhabited Territories

• Baker and Howland Islands: UTC-12 (used theoretically only)
• Bouvet Island: No official time zone (Norwegian uninhabited territory)
• Bir Tawil: No country claims it; no time zone assigned
• Marie Byrd Land: Unclaimed sector of Antarctica; no time zone

Several uninhabited islands and territories have time zones assigned on paper but no one to observe them. Baker Island and Howland Island (US territories in the Pacific) are at UTC-12, the latest time zone on Earth, but no one lives there to check the clock. They are used as a reference point for the "earliest" time zone.

Bir Tawil, the small area on the Egypt-Sudan border that neither country claims, has no official time zone because it has no governing authority. Marie Byrd Land, the only unclaimed sector of Antarctica, similarly has no time zone. These places exist in a temporal no-man's-land.

Disputed Territories

• Crimea: UTC+3 (Russia) or UTC+2 (Ukraine), depending on who you ask
• Western Sahara: UTC+1 (Morocco) or undefined (Sahrawi claim)
• Kashmir: UTC+5:30 (India) or UTC+5 (Pakistan), depending on control
• Impact: Maps and software must choose which time to display

Disputed territories create time zone conflicts that go beyond mere inconvenience. In areas where sovereignty is contested, the choice of time zone is itself a political statement. After Russia annexed Crimea in 2014, the peninsula switched from Kyiv time (UTC+2) to Moscow time (UTC+3), a one-hour jump that symbolized the change in control.

Software companies face difficult decisions about disputed territory time zones. Google, Apple, and Microsoft must choose which time zone to display for places like Kashmir, and their choices can generate diplomatic protests. The IANA time zone database tries to be politically neutral but inevitably makes choices that some parties dispute.

Scientific Stations and Bases

• Antarctic Bases: Choose their own time zone (see poles article)
• Deep Ocean Research: Uses UTC
• Space Agencies: UTC for coordination
• Submarines: UTC for navigation; base time for crew life

Scientific outposts in extreme environments generally default to UTC or to the time zone of their home base. Deep-sea research vessels and submersibles use UTC for all scientific measurements and communication, even when the crew maintains a different schedule for daily life.

Submarines, which operate in complete isolation from daylight, use UTC for navigation and their home port's time zone for crew schedules. This allows the crew to maintain a connection to the rhythms of home while keeping navigation precise. Some submarine crews report that losing all natural light cues makes time feel especially abstract.

Key Facts

• The ISS uses UTC because it experiences 16 sunrises per day.
• Ships use UTC for navigation but the captain can set any clock time for crew life.
• Baker Island (UTC-12) is the "latest" time zone but has no inhabitants.
• Disputed territories like Crimea have conflicting time zones depending on political recognition.
• Submarines use UTC for navigation and home port time for crew schedules.

Fun Facts

• ISS astronauts see 16 sunrises and 16 sunsets every 24 hours.
• Bir Tawil, unclaimed by any country, has no official time zone.
• Ship captains have essentially dictatorial power over what time it is on their vessel.
• The IANA time zone database has occasionally received diplomatic complaints about its choices.

Final Thoughts

The places without clear time zones, from orbiting space stations to unclaimed desert strips, expose the seams in our timekeeping system. They remind us that time zones are a human invention designed for inhabited, governed spaces, and that in the gaps between nations, in disputed lands, on the open sea, and in orbit, time becomes whatever we agree it should be.