1. If GPS is Disabled but Location Services Are On

• Wi-Fi or Cellular Triangulation: Phones can approximate location using nearby Wi-Fi networks or cell towers. Apps like Google’s Find My Device or Apple’s Find My may still show a rough location.
• Google Maps Timeline: If location history is enabled, it records movements even with GPS off (requires access to the person’s Google account).

2. If Location Services Are Fully Disabled

• Bluetooth Tracking: Apps like Tile or Apple AirTags can track devices via Bluetooth, but they require physical access to attach the tracker.
• SIM Card Tracking: Mobile carriers can approximate a phone’s location using cell towers (requires account holder access and legal justification).
• Spyware Apps: Apps like mSpy or FlexiSPY claim to track devices without GPS, but they require physical installation on the target phone and are illegal without consent.

3. Limitations and Risks

• Accuracy: Non-GPS tracking (e.g., Wi-Fi/cellular) is far less precise (often within hundreds of meters).
• Legality: Tracking adults without consent is illegal in most jurisdictions. Exceptions apply only to minors (parental rights) or owned devices (e.g., company phones with employee consent).
• Ethical Concerns: Unauthorized tracking violates trust and privacy, damaging relationships.

4. Legitimate Alternatives

• Parental Control Apps: Use apps like Google Family Link or Apple Screen Time to monitor minors (with their knowledge and consent).
• Lost Device Features: Use built-in tools like Find My iPhone or Find My Android for devices you own.
• Carrier Assistance: Report a lost/stolen phone to your carrier for help (proof of ownership required).

5. Avoid Unethical/Illegal Methods

• Spyware: Many apps marketed as “undetectable” are scams or malware. They often violate app store policies and laws.
• Social Engineering: Tricking someone into enabling location sharing is unethical and illegal.
• SIM Cloning: Illegal and technically complex.

The Global Positioning System (GPS) is a satellite-based navigation system that provides location and time information anywhere on Earth. Here’s a simplified breakdown of how it works:

1. The Three Main Components

GPS relies on three segments:

• Space Segment: A constellation of 24–32 satellites orbiting Earth at ~12,550 miles (20,200 km). These satellites continuously transmit radio signals.
• Control Segment: Ground stations that monitor and manage satellite orbits, clocks, and data.
• User Segment: GPS receivers (e.g., in phones, cars, or wearables) that pick up satellite signals to calculate position.

2. How Signals Determine Location

A GPS receiver calculates its position using trilateration:

1. Satellite Signals: Each satellite broadcasts a unique signal containing:
   • Its location in orbit.
   • The exact time the signal was sent (using ultra-precise atomic clocks).
2. Time Delay Measurement:
   The receiver measures the time delay between when a signal was sent and when it was received. Since radio waves travel at the speed of light (~186,000 miles/second), the receiver calculates its distance from each satellite:

   $Distance=Speed of Light\times Time Delay$Distance=Speed of Light×Time Delay

3. Trilateration:
   • With signals from 3 satellites, the receiver can determine a 2D position (latitude and longitude).
   • With 4+ satellites, it calculates a 3D position (latitude, longitude, and altitude).

3. Key Factors for Accuracy

• Satellite Geometry: Signals from widely spaced satellites improve accuracy.
• Signal Obstruction: Buildings, trees, or mountains can block signals.
• Atmospheric Delay: The ionosphere and troposphere slow radio waves slightly, but modern GPS corrects for this.
• Receiver Quality: Better receivers use advanced algorithms and multiple satellite systems (e.g., GPS + GLONASS + Galileo).

4. How GPS Satellites Stay Precise

• Atomic Clocks: Satellites use atomic clocks for nanosecond-level timekeeping.
• Ground Control: Stations constantly update satellite orbits and clock data to ensure accuracy.

5. Common Uses of GPS

• Navigation: Cars, planes, ships, and smartphones.
• Tracking: Fleet management, wildlife collars, or stolen vehicles.
• Timing: Synchronizing power grids, financial networks, and cell towers.
• Mapping: Surveying and geotagging photos.

6. Beyond Basic GPS

• Assisted GPS (A-GPS): Uses cell towers or Wi-Fi to speed up location fixes (common in phones).
• Differential GPS (DGPS): Ground-based corrections for centimeter-level accuracy (used in surveying).
• Multi-Constellation Systems: Modern devices combine GPS with other systems (e.g., EU’s Galileo, Russia’s GLONASS) for better coverage.

कैल्शियम हड्डियों और दांतों को मजबूत बनाने के लिए बहुत जरूरी है। यह मांसपेशियों को ठीक से काम करने, हृदय को स्वस्थ रखने और तंत्रिकाओं को संदेश भेजने में भी मदद करता है।

एक दिन में एक इंसान को कितना कैल्शियम लेना चाहिए, यह उसकी उम्र और कुछ अन्य कारकों पर निर्भर करता है।

आमतौर पर, प्रतिदिन कैल्शियम की आवश्यकता इस प्रकार होती है:-

बच्चे

• आयु 2 से 3 वर्ष: 700 मिलीग्राम
• आयु 4 से 8 वर्ष: 1,000 मिलीग्राम

औरत

• आयु 9 से 18 वर्ष: 1,300 मिलीग्राम
• आयु 19 से 50 वर्ष: 1,000 मिलीग्राम
• 51 वर्ष से अधिक आयु: 1,200 मिलीग्राम

प्रेग्नेंट औरत

• 19 वर्ष से कम आयु: 1,300 मिलीग्राम
• आयु 19 और उससे अधिक: 1,000 मिलीग्राम

स्तनपान कराने वाली महिलाएं

• 19 वर्ष से कम आयु: 1,300 मिलीग्राम
• आयु 19 और उससे अधिक: 1,000 मिलीग्राम

पुरुषों

• आयु 9 से 18 वर्ष: 1,300 मिलीग्राम
• आयु 19 से 70 वर्ष: 1,000 मिलीग्राम
• 71 वर्ष से अधिक आयु: 1,200 मिलीग्राम

कैल्शियम के अच्छे स्रोत 👉👉

⚫ दूध और दूध उत्पाद: दूध, दही, पनीर

⚫ हरी पत्तेदार सब्जियां: पालक, सरसों, मेथी

⚫ सूखे मेवे: बादाम, किशमिश

⚫ अनाज: सोयाबीन, टोफू