Telescope vs StargazerLog

Telescope turns your iPhone into a complete stargazing companion. Whether you're a first-time sky-watcher or a seasoned amateur astronomer, Telescope helps you plan your sessions, identify what's overhead, and keep a lasting record of everything you observe. Tonight tab — know what to look at before you step outside. Telescope computes real-time visibility for hundreds of deep-sky objects and planets based on your GPS location. Every object is ranked by peak altitude so you always start with the best targets. Filter by type — planets, stars, nebulae, galaxies, open clusters, globular clusters — and tap any row for full details. Full Catalog — browse the complete object library at any time. Each entry shows magnitude, constellation, minimum aperture needed (naked eye, binoculars, or telescope size), and a description. Mark favorites to jump back quickly, or add objects to your wishlist for future sessions. Observation Log — record your sightings as you make them. Log date, location, telescope used, conditions, and personal notes for every object you observe. Your history builds into a searchable personal archive of the night sky. Accurate Astronomy — positions are computed using established low-precision ephemeris formulae (Meeus, Duffett-Smith) accurate to roughly ±1°. Planet positions update in real time. All calculations happen on-device; no internet connection required. - Tonight visibility ranked by peak altitude and score - Real-time planet positions for Mercury, Venus, Mars, Jupiter, Saturn - Deep-sky catalog: nebulae, galaxies, clusters, and more - Personal observation log with notes and conditions - Favorites and wishlist for fast session planning - Works fully offline

StargazerLog tells you what's happening in the sky above you tonight — real stars, real constellations, real math. Computed on your device from genuine astronomical catalogs, accurate anywhere on Earth. WHAT IT DOES • Tonight's constellations: which of the 88 constellations are up right now, which direction to face, and how high to look — built on a catalog of the brightest real stars (Sirius, Vega, Orion's Belt and more). • Constellation finder: tap any constellation for its star chart, brightest stars, and how to spot it. • Stargazing score: a 0–100 rating of tonight's sky conditions — moonlight, darkness windows — so you know if it's worth heading out. • Meteor showers & sky events: Perseids, Geminids and every major annual shower with real peak dates, plus full moons — see what's coming in the next 30 days. • Moon phase now: current phase, illumination, and moon age at a glance. • Planets tonight: which of Mercury, Venus, Mars, Jupiter and Saturn clear the horizon after dark — and where to look. • Nightly reminder: an optional "Tonight's Sky" notification with what's visible after dark. BUILT ON REAL DATA Star positions come from the Yale Bright Star Catalogue, constellations from the official IAU 88, meteor shower dates from the International Meteor Organization — all computed with deterministic astronomy on your device. No accounts, no guessing, no made-up data. SET YOUR LOCATION Pick a city or enter your exact latitude and longitude, and the whole sky is recomputed for where you actually are. STARGAZERLOG PLUS Core features are free. StargazerLog Plus unlocks every constellation tonight, search, and the 7-Day Sky Ahead — a week of nightly moon phases, the best planets to spot each night, and the darkest sky for stargazing. Available as an auto-renewing subscription, or pay once with the Lifetime unlock. Clearly priced, cancel anytime. Subscription: auto-renews unless canceled ≥24h before the period ends; payment charged to your Apple ID at confirmation; manage/cancel in App Store settings. Lifetime is a one-time purchase — no subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://stargazerlog.com/privacy