Tonight's Sky Guide

See what's visible in your night sky tonight

Enter your location and date to see visible planets, notable stars, meteor showers, ISS passes, and deep sky objects above the horizon tonight.

How to Use

  1. 1
    Enter your location and the observation date

    Provide your geographic coordinates or select your city. Specify the date and approximate start time for your observing session. The tool uses these inputs to compute celestial object positions, rise and set times, and the local dark sky window between astronomical twilight end and start.

  2. 2
    Browse tonight's featured objects by category

    The guide organizes results into planets, bright stars, meteor showers, ISS and satellite passes, deep-sky objects, and special events. Each entry shows altitude, azimuth, best viewing time, required equipment (naked eye, binoculars, or telescope), and a brief description of what to look for.

  3. 3
    Plan your observation sequence

    Sort results by altitude, brightness, or type to build a logical sequence for your session. The tool highlights objects near the meridian (highest altitude) at your chosen viewing time and flags any conjunction, opposition, or occultation events visible from your location that night.

About

Observational astronomy connects human curiosity to the universe on the most immediate, embodied level: looking up at a real sky on a real night and finding the objects that generations of observers have catalogued and named. Practical sky guides have evolved from printed almanacs and planispheres to digital planetarium software and now to real-time interactive tools that account for your precise location and atmospheric conditions. The underlying mathematics, spherical trigonometry applied to the transformation between celestial and horizon coordinate systems, has remained constant.

The information available for a single night's sky is remarkably rich. Planetary positions are computed from precise orbital elements maintained by the Jet Propulsion Laboratory and updated continuously. Satellite pass predictions draw on the Space-Track catalog of orbital elements for thousands of objects in low Earth orbit. Meteor shower schedules are maintained by the International Meteor Organization based on decades of systematic observation. Deep-sky object catalogs derive from historical surveys including the Messier catalog of 110 objects, the New General Catalogue of 7,840 objects, and modern photometric surveys resolving millions of sources.

Effective use of a sky guide transforms an observing session from a random scan into an intentional scientific and aesthetic experience. Knowing that Jupiter is near opposition, or that a Perseid outburst is predicted, or that a double star lies exactly 3 degrees east of a bright naked-eye star, empowers observers at every experience level. The best observing habits combine preparation through sky guides with flexible adaptation to actual sky conditions, equipment, and the unexpected beauty of chance encounters with faint comets, iridescent noctilucent clouds, or auroral displays.

FAQ

How do I find planets in the night sky without equipment?
Planets can be distinguished from stars by their steady light compared to the twinkling caused by atmospheric refraction in stars, and by their placement along the ecliptic, the plane of the solar system. Jupiter and Venus are often the brightest objects in the night sky outside the Moon and Sun. Saturn appears as a yellowish steady light, Mars as distinctly reddish, and Mercury only briefly visible near the horizon at dusk or dawn. A tonight's sky guide shows each planet's azimuth and altitude for any time and location, removing the guesswork from identification.
When is the best time to observe deep-sky objects?
Deep-sky objects including nebulae, star clusters, and galaxies are best observed during astronomical twilight darkness, when the Sun is more than 18 degrees below the horizon. New moon nights provide the darkest skies because the Moon's reflected light can wash out faint objects significantly. Objects near the meridian (due south in the northern hemisphere) are at their highest altitude and seen through the least atmosphere, minimizing extinction and blurring. For most observers, late autumn through early spring nights are longest, offering maximum dark time at mid-latitudes.
How accurate are ISS pass predictions?
ISS pass predictions are based on current two-line element (TLE) orbital data published by the United States Space Force and are typically accurate to within a few seconds several days in advance. The ISS orbits Earth at about 408 kilometers altitude every 92 minutes, completing roughly 15.5 orbits per day. Orbital drag causes the orbit to slowly decay, and periodic reboosts by visiting spacecraft change the orbital parameters. Predictions beyond a week become increasingly uncertain. The best passes, called flares, can briefly reach magnitude -5 or brighter and last one to seven minutes across the visible sky.
What is astronomical twilight and how does it affect observing?
Twilight is divided into three phases based on the Sun's angular distance below the horizon. Civil twilight (0 to 6 degrees below) allows outdoor activities without artificial light. Nautical twilight (6 to 12 degrees) is when the horizon becomes difficult to see. Astronomical twilight (12 to 18 degrees) is when the sky is still faintly illuminated; only when the Sun exceeds 18 degrees below the horizon is the sky fully dark. At midsummer latitudes above 48°N, astronomical twilight can persist all night near the summer solstice, making it impossible to observe faint objects.
How do meteor shower predictions work?
Meteor showers occur when Earth passes through streams of debris shed by comets along their orbital paths. Because Earth crosses the same debris streams at the same points in its orbit each year, meteor showers peak on predictable calendar dates: the Perseids peak around August 12, the Geminids around December 14, and the Leonids around November 17. The zenithal hourly rate (ZHR) published by the International Meteor Organization estimates the number of meteors a single observer would see per hour under ideal conditions with the radiant at the zenith. Actual observed rates are typically 20 to 50% of ZHR due to sky conditions and radiant altitude.