Solar System Clock & Planetary Simulator

Interactive 2D planetary simulator and cosmic clock. Drag planets or the Moon with mouse or touch, inspect Keplerian orbital dynamics, sub-lunar zenith points, and real-time planet parades!

Simulated Date: 2000-01-01 12:00:00 UTC

Speed: 1 sec = 1 day

📍 Moon zenith over: Indijos vandenynas (Maldyvai)

🌌 Live Planetary Orbital Positions

Planet	Orbital Period	Distance (AU)	Orbital Angle	Status

Related Tools (Astronomy & Space)

What is the Solar System Clock and how does it work?

Time in the Solar System is not a simple 24-hour clock face. It is a grand, precision cosmic orchestration governed by Kepler’s Laws of Planetary Motion. Every planet orbits the Sun at a unique speed – Mercury completes a revolution in just 88 days, while distant dwarf Pluto takes 248 Earth years! This interactive Solar System Clock & Planetary Simulator allows you to visually inspect planet locations (including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and dwarf Pluto) and scrub time by grabbing celestial bodies with your mouse or touchscreen.

How to use interactive controls and customize parameters?

The tool is designed for intuitive exploration on both desktop monitors and mobile touchscreens:

Interactive Drag & Drop Time Scrubbing: Click/touch and drag any planet or orbit line around the Sun. All planetary positions and dates instantaneously update at 60 FPS based on orbital geometry.
Moon Scrubbing in Zoomed Mini-Widget: Inspect the zoomed Earth & Moon system in the corner. Dragging the Moon around Earth allows fine-tuning days and hours!
Speed Presets & Time Jumps: Select simulation speeds from real-time (1x) up to 1 sec = 6 hours (default), 12 hours, 1 day, 1 week, or 1 year, or use one-click jump buttons for ±1 month and ±1 year.
Orbits & Labels Toggles: Use Orbits: ON/OFF and Labels: ON/OFF toggles to clean up the canvas for cinematic viewing.
Zoom & Fullscreen Mode: Scale the viewport with 🔍 + and 🔍 - or click ⛶ Full Screen to immerse yourself in an edge-to-edge cosmic canvas!

Visual Scale vs. Mathematical Accuracy

To fit all 8 planets comfortably on a single screen, the simulator uses a stylized visual scale. In reality, both physical planet sizes and cosmic distances are vastly different: if Earth were drawn as a small 12 mm sphere, Jupiter would be 13 cm wide, the Sun would be a 1.3-meter giant, and Neptune’s orbit would sit over 4 kilometers away!

However, while orbits and planet sizes are visually scaled for screen clarity, the mathematical calculations rely on the astronomically exact J2000 epoch. Planet angles, mean orbital speeds, the 29.53-day synodic Moon cycle, and tropical Sub-Lunar Zenith Points are calculated with 100% mathematical precision using real astronomical formulas!

Why this simulator is fun and educational for all ages

This simulator serves as an engaging educational tool for children, students, teachers, and space enthusiasts alike:

For Children & Students: Visually grasp orbital speeds, day/night cycles, Moon phases (New Moon, Quarter, Full Moon, Waning), and why outer giants move so slowly.
For Teachers & Educators: Demonstrate Keplerian motion, the J2000 astronomical epoch, and planetary conjunctions (Parades) when 3+ planets line up in a narrow sector.
For Astronomy Enthusiasts: Track the tropical Sub-lunar Zenith Point in real time (see which tropical region – Maldives, Amazon, Hawaii, or Caribbean – the Moon is hovering directly overhead).

Frequently Asked Questions (FAQ)

What is an AU (Astronomical Unit)?

An AU (Astronomical Unit) is a standard unit of length in astronomy, defined as the mean distance from Earth to the Sun – approximately 149,597,870 kilometers (~93 million miles). In the simulator and position table, AU is used for easy comparison of planetary distances: Earth is at 1.00 AU, Mercury is at 0.39 AU, and distant Neptune is at 30.07 AU!

How do I use planet dragging (Drag & Drop)?

Click and drag any planet or its orbit line with your mouse or finger on mobile. Rotating a planet around the Sun instantaneously recalculates the simulation date and moves all 7 other planets and the Moon to their precise corresponding positions at 60 FPS!

Are planet sizes and orbital distances rendered to true physical scale?

No, both physical planet sizes and orbital radii are deliberately stylized for screen viewing. In real life, scale differences are extreme: if Earth were drawn as a small 12 mm sphere, Jupiter would be 13 cm wide, the Sun would be a 1.3-meter giant, and Neptune’s orbit would be located over 4 kilometers away! Therefore, planet sizes and orbits are visually adapted so all 8 planets fit on screen, while their orbital speeds, angles, and time calculations remain 100% mathematically accurate to the J2000 epoch.

What is a "Planet Parade" (Alignment / Conjunction)?

It is an astronomical event where 3 or more planets line up in a narrow angular sector relative to the Sun. The simulator automatically detects and highlights these alignments with a glowing top banner.

How is the "Moon zenith over..." (Sub-lunar Point) calculated?

The Moon moves overhead within the tropical belt (between ~-28.5° and +28.5° latitude). Based on simulated UTC time and lunar orbit, the exact sub-lunar longitude and corresponding region (e.g. Maldives, Amazon, Hawaii, Central Africa, or Caribbean) are computed.

Why does Mercury orbit the Sun in 88 days while Neptune takes 165 years?

This is explained by Kepler’s 3rd Law of Planetary Motion: planets closer to the Sun experience stronger gravitational force and move much faster (Mercury orbits at ~47 km/s, while Neptune moves at just ~5.4 km/s along a vastly larger path).

Can I simulate historical or future dates?

Yes! Using time jump buttons (-1 year, +1 year, -1 mo., +1 mo.) or dragging planets, you can simulate any date in history or the future – such as your birthday, the 1969 Apollo 11 Moon landing, or upcoming planetary conjunctions!

What is the difference between a synodic and sidereal lunar month?

A sidereal month (27.32 days) is the time it takes the Moon to complete a 360° orbit around Earth relative to distant stars. A synodic month (29.53 days) is the complete Moon phase cycle from New Moon to New Moon, accounting for Earth’s concurrent movement around the Sun.

Does this tool require external libraries or downloads?

No! The simulator is built using pure HTML5 Canvas and JavaScript with zero external dependencies (0 KB). It loads instantly on all desktop and mobile browsers.