Lambert vs Sessagesimale

This app turns your iPhone into a geological compass, a tool for each geologist. It can be used to measure the direction of dip and the angle of dip of geological strata. The app shows the current device orientation in a realtime stereographic projection. The data can be previewed in projection diagrams (Wulff and Schmidt Net) and transferred to your computer. You can add text to the measurements and plot the measurement localities on a map.

Sessagesimale is a calculator built for anyone working with base-60 values — angles, time, geographic coordinates, surveying, astronomy, and navigation. No more manual conversions between decimal and degrees/minutes/seconds: enter values exactly as you read them on a map, a measuring instrument or a stopwatch, and get the normalized result instantly. FREE, WITH AN OPTIONAL UNLOCK Download it free and get 15 calculations a day, in every mode. One purchase, no subscription, unlocks the full version: unlimited calculations, the compass, the Apple Watch app and Shortcuts actions. If you already bought the paid app, everything is already unlocked. THREE MODES IN ONE APP • Angle (° ' ") — with two sub-formats: DMS (degrees, minutes, seconds, e.g. 40° 42' 46") and DDM (degrees and decimal minutes, e.g. 40° 42.7667'), the standard used by many GPS receivers and in maritime/aeronautical navigation. • Time (h m s) — for hours, minutes and seconds. • Decimal — for a classic calculator experience. The value converts automatically when you switch modes. Mode, DMS/DDM sub-format and memory are remembered on relaunch. NATURAL FIELD-BY-FIELD ENTRY A contextual key guides your input: tap • ' to move from degrees to minutes, • " for seconds. On seconds (or minutes in DDM) it becomes your language's decimal separator — a period in English, a comma in many other languages. The active field is always highlighted. FULL ARITHMETIC Addition and subtraction between sexagesimal values with automatic carrying (45' + 30' = 1° 15'), multiplication and division by a scalar, chained operations, repeat the last calculation with "=". Dividing by zero shows an explicit error instead of a silent, wrong result. DUAL DISPLAY, ALWAYS VISIBLE As you type in sexagesimal format, read the decimal equivalent in real time (and vice versa). CONVERSIONS PANEL One tap to see the current value in every format at once — DMS, DDM, time, decimal degrees, radians, gon, and the hours↔degrees (×15) conversion used in right ascension and time zones. Tap any row to copy it. COMPASS (IPHONE) — FULL VERSION Read the magnetic heading from your iPhone's magnetometer: a dial with the cardinal point (N, NE, E…) and the value to a tenth of a degree. Tap Use to bring it into the calculator as an angle. No permission required. NORMALIZE AND RECIPROCAL BEARING Press and hold the display in Angle mode: Normalize brings the angle into 0°–360° (−30° → 330°) and Reciprocal bearing adds 180°. MEMORY & HISTORY MC, MR, M+, M– keys with an always-visible indicator. Every calculation is added to a persistent history: tap an entry to reuse its result, swipe to delete it, share it all as text. COPY, PASTE, SHARE Copy the current value, paste one from the clipboard (it recognizes decimal formats with a period or comma, sexagesimal values with °, ', " or typographic symbols, and the 12:34:56 notation), share via the system sheet. FOR IPAD AND MAC Hardware keyboard supported: digits, operators, Return for the result, Esc to clear everything. ADAPTIVE INTERFACE Layouts for iPhone (portrait and landscape) and iPad, light and dark mode, three alternative icons, full VoiceOver support with contextual labels, haptic feedback. The (?) button opens the tutorial and the About page. APPLE WATCH — FULL VERSION On your wrist, even without your iPhone: a calculator with all three modes (Angle, Time, Decimal), the four operations, DMS/DDM format, a history of recent calculations and a conversions panel. A compact keypad designed for the small display, with haptic feedback. The watch's history and settings are independent from those on your iPhone. SHORTCUTS — FULL VERSION Two actions for the Shortcuts app, Spotlight and Siri: Convert angle and Calculate. They run in the background, without opening the app. PRIVACY Works offline. No account, no data collection. The only connection is to the App Store, for the unlock purchase. History and memory stay on your device only.