eqDayCalib

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# eqDayCalib

**Quick Start**

Place pictures and only pictures with valid EXIF in DirectoryA
Prepare a second directory for the result Directory B
Run the script : 
**EqDayCalib -i Full_Path_of_Directory_With_Pictures -o Full_Path_of_Target_Directory**

**What?**

This script aims to perform equatorial mount periodic error chaterization during day time.
It generates temporal and spectral result csv files and offer basic plots:

![Period Error Plot](https://github.com/Cloud-Tomat/eqDayCalib/blob/main/doc/Periodic_error.png)

![Period Error DFT](https://github.com/Cloud-Tomat/eqDayCalib/blob/main/doc/Dft.png)

**Why?**

- Avoid wasting good observation night to perform such task
- To not wait to have a clear sky to check the result of mechanical adjustments

**How?**

The principle consit in shooting picture at regular interval with long focal lens/telescope while Right Ascencion motor tracking is running. 
Longer the focal will be, higher will be the measurment resolution.

The script does the following:
- Calculate the displacement between the pictures,
- Deduce from this displacement Right Ascencsion Speed between pictures
- Neutralize tracking speed to only keep tracking speed error
- Perform integration of these trackings speed error  to calculate Position Error
- Calculate Discrete Fourrier Transform of Position Error
- Save all that to CSV and Graph it

**Procedure**

Prequisite :
- Equatorial mount with Right ascencion motorized !
- Digital Camera able to save picture with EXIF data
- Lens or telescope with long focal (200 to 2000 mm depending on pixel size of camera sensor)

Step 1: Take the pictures
- Install the Digital Camera and the lens telescope.
- Declination must be set to **90° or -90°** so the movement on the picture appear as a translation
- Pay special attention to have a good focus on all the range covered during the process
- Picture format **JPEG is fine**, pictures must contain **EXIF data**
- Take a picture each 5 to 10s longer focal requires shorter intervall
- Take picture to cover 3 to 4 turns of worm (35 to 45 mn)

**Note** : Pictures must contain recognizable elements (not clear blue sky!)
Example of working pictures :
![Example of pictures](https://github.com/Cloud-Tomat/eqDayCalib/blob/main/doc/DSC09710_pipp.gif)

Step 2 : Download and unzip the script file
The python script and its dependencies has been packaged with pyinstaller 
- Download the script here :
- Unzip it to some place you will remember

Step 2 : preparation of directories
Create 2 directories:
      - A first directory that contains the pictures and **only** the pictures (any other files will cause the script to stop)
      - A second working directory where the script will place the results file

Step 3 : Running the script
- Open Cmd on Windows and go to the directory where you unzipped the script and run 
**EqDayCalib -i Full_Path_of_Directory_With_Pictures -o Full_Path_of_Target_Directory**
- Wait for the script to execute

Step 4 : Analyse
At the end of the process, the script will open your default browser with 2 tabs containing temporal and frequency data plot.
Plot are generated by Plotly, it's possible to navigate though the data using top right menu
In addition the script generate 3 csv files in the target directory
- {TimeStamp}_Eq_calib_raw_results.csv : displacement between picture in Pixel and  displacement angle in degrees
- {TimeStamp}_Eq_calib_scaled_EP.csv : Position error in arcsec (")
- {TimeStamp}_Eq_calib_EP_DFT.csv : Discrete Fourrier Transform of position error

**In addition**
It is possible to plot again the 2 last files using
**EqView -i Name_of_the_File.csv**

eqDayCalib

eqDayCalib Latest Version Download

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