function return_astronomical_objects_list($dbc, $sort_type, $sort_type_info)
{
    $return_data;
    if ($_GET['mark'] && isset($_SESSION['user_id'])) {
        $query = 'INSERT INTO users_objects_marked (user_id, object_id) VALUES (' . $_SESSION['user_id'] . ', ' . mysqli_real_escape_string($dbc, trim($_GET['mark'])) . ')';
        $result = mysqli_query($dbc, $query);
        if ($result) {
            echo '<p class="notification">The object has been succesfully <strong>marked</strong></p>' . "\n";
        }
    }
    if ($_GET['unmark'] && isset($_SESSION['user_id'])) {
        $query = 'DELETE FROM users_objects_marked WHERE user_id=' . $_SESSION['user_id'] . ' && marked_id=' . mysqli_real_escape_string($dbc, trim($_GET['unmark']));
        $result = mysqli_query($dbc, $query);
        if ($result) {
            echo '<p class="notification">The object has been succesfully <strong>unmarked</strong></p>' . "\n";
        }
    }
    if (!empty($_GET['sorting_column'])) {
        $sorting_column = mysqli_real_escape_string($dbc, trim($_GET['sorting_column']));
    } else {
        $sorting_column = 'object_id';
    }
    if (!empty($_GET['sorting_order'])) {
        $sorting_order = mysqli_real_escape_string($dbc, trim($_GET['sorting_order']));
    } else {
        $sorting_order = 'ASC';
    }
    $return_data .= '<table>' . "\n";
    $return_data .= '<tr>' . "\n";
    $return_data .= '<th>' . "\n";
    $return_data .= '<a href="?p=' . trim($_GET['p']);
    if (!empty($_GET['user_id'])) {
        $return_data .= '&amp;user_id=' . trim($_GET['user_id']);
    } else {
        if (!empty($_GET['constellation_id'])) {
            $return_data .= '&amp;constellation_id=' . trim($_GET['constellation_id']);
        }
    }
    $return_data .= '&amp;sorting_column=object_messier_number&amp;';
    if ($sorting_column == 'object_messier_number' && $sorting_order == 'ASC') {
        $return_data .= 'sorting_order=DESC';
    } else {
        $return_data .= 'sorting_order=ASC';
    }
    $return_data .= '">Messier</a>' . "\n";
    $return_data .= '</th>' . "\n";
    $return_data .= '<th>' . "\n";
    $return_data .= '<a href="?p=' . trim($_GET['p']);
    if (!empty($_GET['user_id'])) {
        $return_data .= '&amp;user_id=' . trim($_GET['user_id']);
    } else {
        if (!empty($_GET['constellation_id'])) {
            $return_data .= '&amp;constellation_id=' . trim($_GET['constellation_id']);
        }
    }
    $return_data .= '&amp;sorting_column=object_ngc_number&amp;';
    if ($sorting_column == 'object_ngc_number' && $sorting_order == 'ASC') {
        $return_data .= 'sorting_order=DESC';
    } else {
        $return_data .= 'sorting_order=ASC';
    }
    $return_data .= '">NGC</a>' . "\n";
    $return_data .= '</th>' . "\n";
    $return_data .= '<th>' . "\n";
    $return_data .= '<a href="?p=' . trim($_GET['p']);
    if (!empty($_GET['user_id'])) {
        $return_data .= '&amp;user_id=' . trim($_GET['user_id']);
    } else {
        if (!empty($_GET['constellation_id'])) {
            $return_data .= '&amp;constellation_id=' . trim($_GET['constellation_id']);
        }
    }
    $return_data .= '&amp;sorting_column=object_name&amp;';
    if ($sorting_column == 'object_name' && $sorting_order == 'ASC') {
        $return_data .= 'sorting_order=DESC';
    } else {
        $return_data .= 'sorting_order=ASC';
    }
    $return_data .= '">Name</a>' . "\n";
    $return_data .= '</th>' . "\n";
    $return_data .= '<th>' . "\n";
    $return_data .= '<a href="?p=' . trim($_GET['p']);
    if (!empty($_GET['user_id'])) {
        $return_data .= '&amp;user_id=' . trim($_GET['user_id']);
    } else {
        if (!empty($_GET['constellation_id'])) {
            $return_data .= '&amp;constellation_id=' . trim($_GET['constellation_id']);
        }
    }
    $return_data .= '&amp;sorting_column=object_type_id&amp;';
    if ($sorting_column == 'object_type_id' && $sorting_order == 'ASC') {
        $return_data .= 'sorting_order=DESC';
    } else {
        $return_data .= 'sorting_order=ASC';
    }
    $return_data .= '">Type</a>' . "\n";
    $return_data .= '</th>' . "\n";
    $return_data .= '<th>' . "\n";
    $return_data .= '<a href="?p=' . trim($_GET['p']);
    if (!empty($_GET['user_id'])) {
        $return_data .= '&amp;user_id=' . trim($_GET['user_id']);
    } else {
        if (!empty($_GET['constellation_id'])) {
            $return_data .= '&amp;constellation_id=' . trim($_GET['constellation_id']);
        }
    }
    $return_data .= '&amp;sorting_column=constellation_name&amp;';
    if ($sorting_column == 'constellation_name' && $sorting_order == 'ASC') {
        $return_data .= 'sorting_order=DESC';
    } else {
        $return_data .= 'sorting_order=ASC';
    }
    $return_data .= '">Constellation</a>' . "\n";
    $return_data .= '</th>' . "\n";
    //$return_data .= '<th>Links</th>' . "\n";
    $return_data .= '<th>Observations</th>' . "\n";
    if (isset($_SESSION['user_id'])) {
        $return_data .= '<th>Marked</th>' . "\n";
    }
    $return_data .= '</tr>' . "\n";
    //if(login_check()){
    //	$return_data .= '<th>Starred user_id' . $_SESSION['user_id'] . '</th>';
    //}
    require_once 'php_scripts/function_observations_user_array.php';
    $observations_array = observations_user_array($dbc);
    switch ($sorting_column) {
        case 'constellation_name':
            $sorting_table = 'constellations';
            break;
        default:
            $sorting_table = 'astronomical_objects';
            break;
    }
    $query = 'SELECT astronomical_objects.object_id, astronomical_objects.object_messier_number, astronomical_objects.object_ngc_number, astronomical_objects.object_name, astronomical_objects.object_thumb_url, astronomical_objects.object_url_wikipedia, astronomical_objects_types.object_type_name, astronomical_objects_types.object_type_thumb_url, astronomical_objects_types.object_type_url_wikipedia, ';
    //astronomical_objects_lists.list_name,
    $query .= 'constellations.constellation_id,  constellations.constellation_name, constellations.constellation_thumb_url, constellations.constellation_url_wikipedia
				FROM astronomical_objects
				INNER JOIN astronomical_objects_types
				USING (object_type_id) ';
    //LEFT JOIN astronomical_objects_lists_objects
    //USING (object_id)
    //LEFT JOIN astronomical_objects_lists
    //USING (list_id)
    $query .= 'INNER JOIN constellations
				USING (constellation_id)';
    switch ($sort_type) {
        case 'marked':
            $query .= ' INNER JOIN users_objects_marked
						USING (object_id)
						WHERE users_objects_marked.user_id =' . $sort_type_info;
            break;
        case 'constellation':
            $query .= ' WHERE constellations.constellation_id=' . $sort_type_info;
            break;
        case 'picture':
            $query .= ' INNER JOIN pictures_astronomical_objects
						USING (object_id)
						WHERE pictures_astronomical_objects.picture_id=' . $sort_type_info;
    }
    $query .= ' ORDER BY ' . $sorting_table . '.' . $sorting_column . ' ' . $sorting_order;
    $table_id = mysqli_query($dbc, $query);
    if (isset($_SESSION['user_id'])) {
        $query_m = 'SELECT marked_id, object_id FROM users_objects_marked WHERE user_id=' . $_SESSION['user_id'];
        $table_id_m = mysqli_query($dbc, $query_m);
        $marked_objects = array();
        while ($row_m = mysqli_fetch_array($table_id_m)) {
            array_push($marked_objects, array($row_m['object_id'], $row_m['marked_id']));
        }
        //echo '<p class="notification">' . $query_m . ' - ' . mysqli_num_rows($table_id_m) . ' : ' . count($marked_objects) . '</p>';
    }
    while ($row = mysqli_fetch_array($table_id)) {
        $return_data .= '<tr>' . "\n";
        $return_data .= '<td>';
        $return_data .= return_messier_number($row['object_messier_number']);
        $return_data .= '</td>' . "\n";
        $return_data .= '<td>';
        $return_data .= return_ngc_number($row['object_ngc_number']);
        $return_data .= '</td>' . "\n";
        $return_data .= '<td>';
        $return_data .= return_name_data($row['object_id'], $row['object_name'], $row['object_url_wikipedia'], $row['object_thumb_url']);
        $return_data .= '</td>' . "\n";
        $return_data .= '<td>';
        $return_data .= return_object_type_data($row['object_type_name'], $row['object_type_url_wikipedia'], $row['object_type_thumb_url'], '');
        $return_data .= '</td>' . "\n";
        $return_data .= '<td>';
        $return_data .= return_constellation_data($row['constellation_id'], $row['constellation_name'], $row['constellation_thumb_url'], $row['constellation_url_wikipedia']);
        $return_data .= '</td>' . "\n";
        //$return_data .= '<td>';
        //if(!empty($row['object_url_wikipedia'])){
        //	$return_data .= '<a href="' . $row['object_url_wikipedia'] . '"><img src="images/link_wiki.png" alt="wikipedia_link" /></a>';
        //}
        //$return_data .= '</td>' . "\n";
        $return_data .= '<td>';
        $return_data .= return_user_object_observation_data($observations_array, $row['object_id']);
        /*if(isset($observations_array) && !empty($observations_array[$row['object_id']])){
        			for($i = 0; $i<count($observations_array[$row['object_id']]);$i++){
        				echo '<div class="avatar" style="background-image: url(\'' . SITE_IMAGES_DIR_FRONT . SITE_AVATAR_DIR . $observations_array[$row['object_id']][$i][2] . '\');"><div class="observations">' . $observations_array[$row['object_id']][$i][1] . '</div></div>';	
        				//echo 'user: '******'object_id']][$i][0] . ' views: ' . $observations_array[$row['object_id']][$i][1];
        			}
        		}*/
        $return_data .= '</td>' . "\n";
        if (isset($_SESSION['user_id'])) {
            $query_o = 'SELECT object_id FROM observations WHERE MONTH(observation_datetime) = MONTH(NOW()) AND object_id = ' . $row['object_id'];
            $table_id_o = mysqli_query($dbc, $query_o);
            $return_data .= '<td';
            if (mysqli_num_rows($table_id_o) > 0) {
                $return_data .= ' class="now_visible"';
            }
            $return_data .= '>';
            $return_data .= return_user_marked_data($row['object_id'], $marked_objects);
            $return_data .= '</td>' . "\n";
        }
        $return_data .= '</tr>' . "\n";
    }
    $return_data .= '</table>';
    if (mysqli_num_rows($table_id) == 0 && $sort_type == 'marked') {
        return '<p>No objects marked</p>';
    }
    if (mysqli_num_rows($table_id) == 0) {
        return false;
    } else {
        return $return_data;
    }
}
}
echo $astronomical_object_name;
if (!empty($row['object_url_wikipedia'])) {
    echo ' <a href="' . $row['object_url_wikipedia'] . '"><img src="images/link_wiki.png" alt="wikipedia_link" /></a>';
}
?>
</h1>
<script src="js/utils.js"></script>
<script src="js/obs_graph.js"></script>
<canvas id="observations_graph" width="500" height="250">
	<p>This browser doesn't know Canvas.</p>
</canvas>

<?php 
require_once 'php_scripts/function_observations_user_array.php';
$observations_array = observations_user_array($dbc);
?>

<table class="list">
	<tr>
		<td>Type</td>
		<td><?php 
echo return_object_type_data($row['object_type_name'], $row['object_type_url_wikipedia'], $row['object_type_thumb_url'], '');
?>
</td>
	</tr>
	<?php 
if ($row['constellation_id'] > 0) {
    ?>
	<tr>
		<td>Constellation</td>