Constellation Finder – Online Interactive Planisphere by Month
Select month and hour to see a simple star map with major constellations labeled. Educational astronomy fun.
UD5 Toolkit
Discover what's visible in the night sky tonight — tailored for binocular observers. Planets, star clusters, nebulae, galaxies & more.
Observation window: calculating...Try adjusting the type filter or light pollution level.
Select month and hour to see a simple star map with major constellations labeled. Educational astronomy fun.
Enter a date and location to see moonrise/set times and azimuths. Essential for planning moonlit landscapes.
Convert diopter strength to approximate magnification and working distance for macro photography.
Generate a realistic‑sounding exoplanet designation (e.g., Kepler‑442b) and a sci‑fi planet description. For worldbuilding.
See planets and orbits at true scale (or logarithmic). Scroll from the Sun to Pluto. Understand space distances. Canvas.
Watch the planets orbit the Sun in a top‑down 2D view. Adjust speed and zoom. Distances not realistic; beautiful model.
Calculate projector throw distance or screen image size based on throw ratio. Visualize setup. Essential for home theater planning. Local.
Select a vegetable and see its best companion plants and which to avoid. Visual grid with quick reference. Improve garden yield and health naturally.
Enter your exit weight and canopy size to calculate wing loading. Helps determine if you're within the safe recommended range.
Find the optimal TV size for your room or the best viewing distance based on screen size and resolution (1080p, 4K, 8K). Simple THX/SMPTE reference.
Select multiple languages and tools (Node, Python, Mac, Windows) and generate a combined .gitignore.
Calculate probability of k successes when sampling without replacement. Useful for quality control and card games.
Enter a CSS value in vw/vh and see the actual pixel size at current viewport. Dynamic resize demo.
Compute the Euclidean distance between two points in 2D or 3D space. Also shows midpoint. Quick geometry helper.
Enter tank volume and recommended dose to find exact ml or capfuls needed. Avoid overdosing fish.
Enter pond volume and product concentration to determine safe ml or teaspoon of algaecide.
Tap when you see lightning, tap again when you hear thunder. Calculates how far away the storm is in miles/km. Important outdoor safety tool.
Quick reference for frequently used Git commands with examples. Searchable and categorized. A handy resource for all developers.
Convert between inches of mercury and hectopascals for altimeter setting. Essential for pilots.
Calculate how much fertilizer to add based on desired N‑P‑K ppm and water volume. For hydroponics and soil growers.
Select a month and see the modern and traditional birthstones with images and meaning. Classic reference.
Calculate critical care formula volume based on weight. For rabbits, guinea pigs, etc.
Enter two hex or decimal numbers and perform bitwise AND, OR, XOR, NOT, left/right shift. See results in binary.
A searchable list of essential Docker CLI commands for managing containers, images, and volumes. Copy-paste friendly. Always handy.
Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.
Determine your ideal daily macronutrient intake based on TDEE, goal, and diet preference. Free nutrition planning tool with local computation.
Use your device microphone to measure approximate sound pressure level in dB. Not calibrated, for rough reference. Local only.
Calculate how much liquid fertilizer concentrate to add per gallon of water based on desired N concentration.
Learn what water is safe (rain, distilled, low PPM) for pitcher plants and flytraps. Visual PPM scale.
Estimate how much rope you need to restring a djembe and the number of verticals. Get traditional Mali weave instructions.