Explore USNO Navy Mil Data Docs: Access One Day Naval Data and Resources


In this guide, we will explore the United States Naval Observatory (USNO) data and resources available at [USNO Navy Mil](http://www.usno.navy.mil/). This documentation will assist developers in accessing and utilizing the One Day Naval Data and Resources for various applications. Follow the step-by-step instructions to learn how to access this valuable information.

## Table of Contents

1. [Overview of USNO Navy Mil Data](#overview-of-usno-navy-mil-data)
2. [Accessing One Day Naval Data](#accessing-one-day-naval-data)
3. [Parsing and Using the Data](#parsing-and-using-the-data)
4. [FAQs](#faqs)
5. [Related Links](#related-links)

## Overview of USNO Navy Mil Data

The United States Naval Observatory (USNO) provides a wide range of astronomical data and products, including information on time, Earth's orientation, solar system bodies, and stars. These data sets are crucial for various industries, including navigation, communications, and research.

The USNO Navy Mil website offers several APIs and data resources, including the One Day Naval Data. This resource provides information on the:

- Rise, set, and transit times of the Sun and Moon
- Moon phase
- Eclipses
- Meteor showers
- Positions of planets and other celestial bodies

## Accessing One Day Naval Data

This section will guide you through accessing the One Day Naval Data from the USNO Navy Mil website.

1. Visit the [USNO Data Services](http://www.usno.navy.mil/USNO/astronomical-applications/data-services) page.
2. Under "Rise, Set, and Twilight Data," click on the "Form A - One day" link.
3. You will be redirected to the [One Day Naval Data Request Form](http://aa.usno.navy.mil/data/docs/RS_OneDay.php).
4. Fill out the form with the required information:
   - **Location**: Enter the location's latitude, longitude, and elevation.
   - **Time Zone**: Choose the appropriate time zone.
   - **Date**: Select the desired date for the data.
5. Click on the "Compute" button.
6. The requested data will be displayed on the screen in a tabular format.

_NOTE: Please make sure to comply with the [USNO Copyright and Reuse Policy](http://www.usno.navy.mil/USNO/about-us/copyright-and-reuse-policy) when using the data._

## Parsing and Using the Data

After obtaining the One Day Naval Data, you can parse and use the data in your applications. Here's a simple example of how to parse the data using Python.

import requests
from bs4 import BeautifulSoup

# Request the One Day Naval Data
url = "http://aa.usno.navy.mil/cgi-bin/aa_rstablew.pl"
payload = {
    'FFX': 1,
    'xxy': 2021,
    'xxm': 10,
    'xxd': 15,
    'st': 'DC',
    'place': 'Washington',
    'xx0': -77,
    'xx1': 2,
    'xx2': 6,
    'yy0': 38,
    'yy1': 53,
    'yy2': 42,
    'zz1': 0,
    'ZZZ': 'END'
response = requests.post(url, data=payload)

# Parse the response using BeautifulSoup
soup = BeautifulSoup(response.text, 'html.parser')
table = soup.find('pre').text

# Extract and process the data
lines = table.split('\n')
for line in lines:

# Use the data in your application


How often is the USNO Navy Mil data updated?

The USNO Navy Mil data is updated regularly to provide accurate and up-to-date information. The update frequency depends on the specific data resource; some are updated daily, while others may have longer update intervals.

Can I automate the data retrieval process?

Yes, you can automate the data retrieval process using programming languages like Python, JavaScript, or any other language that supports HTTP requests. Just make sure to comply with the USNO Copyright and Reuse Policy.

How do I access historical data?

The USNO Navy Mil website provides historical data for various resources. Visit the USNO Data Services page and select the appropriate data set to access historical data.

Is the USNO Navy Mil data free to use?

Yes, the USNO Navy Mil data is provided free of charge. However, please make sure to comply with the USNO Copyright and Reuse Policy when using the data.

Are there any other resources similar to USNO Navy Mil?

Yes, there are other similar resources available, such as the Jet Propulsion Laboratory's HORIZONS System and the International Earth Rotation and Reference Systems Service (IERS).

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