butango: AI English Sentences vs Chronomap in Cosmos Usage & Stats
butango is a smart English vocabulary app designed to help you learn faster and more effectively.
From searching and learning to personalized review, AI supports your study at every step.
Key Features:
Word search: Instantly look up meanings and related terms
Learning with examples: Understand usage with AI-generated sentences
Smart review: Personalized quizzes based on your progress
Audio support: Practice listening and pronunciation with native audio
Progress tracking: Visualize your learning journey with clear stats
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This is a specialized version of the "When-Wher-What Database" focused on the cosmos. It features the ability to display "what happened where and when in the universe" by intersecting the heliocentric ecliptic coordinates with the time axis. Of course, it also includes the functionality to contribute data to the "When-Where-What Database".
The "When-Where-What Database" is a project where users collaborate to build a comprehensive database that covers all historical events from the origin of the universe to the endless "now," regardless of the field. It aims to accurately display not only "when" but also "where" events occurred, emphasizing both temporal and spatial distances.
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butango: AI English Sentences VS. 
Chronomap in CosmosJanuary 11, 2026