Cosmic clocks: 8 sourced records

What this topic measures

A year is one orbit around the Sun. More distant planets generally have much longer years. The unit is days. This topic uses ratio scoring: a value half the target and a value twice the target are equally far away, so think in multiplicative bands rather than fixed steps.

A record is a named row in the frozen catalog, not necessarily a unique entity. Some topics contain several records with the same value, and a name round accepts any record at the closest distance. The table below is the complete answer set for this topic; there is no hidden shortlist.

All 8 records

Every row links to the original source used for that record. Values are rounded for display only; the scoring engine uses the stored source value. The snapshot date and unit are part of the topic’s definition, so a current live figure may differ.

The table has 8 rows, one for each accepted record. It does not list every alias or spelling variant; the game’s name matcher handles those at answer time. If two records share a value, both remain separate rows.

The range and the gaps

The 8 records run from 88 days to 59,800 days. The median is 2,509 days, with a middle half from 330.1 days to 15,707.5 days. The largest adjacent gap is 29,211 days between Uranus and Neptune. Every record has a distinct value in this snapshot.

The highest listed records are Neptune (59,800 days), Uranus (30,589 days), Saturn (10,747 days). The lowest are Mercury (88 days), Venus (224.7 days), Earth (365.2 days). Use these as anchors before you make a ratio or year estimate; the table below gives every value.

What the table does not tell you

These are single snapshot values in days for The eight planets · Earth days per orbit. The table is not a time series, a range of typical values or a measure of uncertainty. A source can round, revise or use a different definition in a later release; the game uses the stored snapshot for every score. Read the source and the record label before treating a value as a current live measurement.

How to estimate this topic

Orbital periods are listed in Earth days. Inner planets are measured in months, outer planets in decades or centuries. Convert a target to years before choosing a name: 365 days is one year, 4,331 days is about 12 years.

For a method that applies across topics, see the estimation guide. To practise this topic without changing a daily result, open the practice setup for Cosmic clocks. The setup opens first; it does not start a clock automatically.

Recent daily use

This topic has appeared in 2 completed daily rounds. The table lists the most recent 2 uses. Each date opens the full answer page for that flight.

Source, licence and snapshot

The listed source is NASA · Planetary Fact Sheet ↗. Snapshot: 2026-10-24. Licence / attribution: "See source".

We select and transform source records for independently written game rules. The source material remains subject to its original licence. If a value looks wrong, send the topic, record, expected value and source through the contact form; do not send passwords or account credentials.

Related topics

Planet sizes (8 records) · City skylines (8 records) · Mountain heights (8 records) · World Cup winners (8 records)

All 27 topics · Archive · Source attribution