> For the complete documentation index, see [llms.txt](https://docs.astronomyapi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.astronomyapi.com/requests-and-response/observer-parameters.md).

# Observer Parameters

When requesting for location and/or date-time related data, Observer parameters must be sent in the request.

Observer Parameters include the current observer's location and other information. The casing of the properties changes from camel case to snake case when doing a GET request.

| **Parameter**         | **Required** | **Description**                                                          | Sample Value |
| --------------------- | :----------: | ------------------------------------------------------------------------ | ------------ |
| longitude             |      Yes     | Longitude of the observer's location, as Float                           | -84.39733    |
| latitude              |      Yes     | Latitude of the observer's location, as Float                            | 33.775867    |
| elevation             |      Yes     | Elevation from the sea in Meters as Number                               | 50           |
| from\_date / fromDate |      Yes     | Starting date as Date. When doing a GET request from\_date must be used. | 2018-12-20   |
| to\_date / toDate     |      Yes     | Ending date as Date. When doing a GET request to\_date must be used.     | 2018-12-22   |
| time                  |      Yes     | Observer's time as Time                                                  | 08:00:00     |

## Time and Timezones

Astronomy API treats the time requested, as the observer's time. It finds the timezone of the user based on the location specified by `longitude` and `latitude`. The returned times will be as same as the time zone requested.