Pradosha Mahathmyam !!

Jai Sriman Narayana !!
Hara Hara Sankara Jaya Jaya Sankara !!

Yevai Pradosha Samaye Parameswarasya
Kurvanthyananya Mansangri Saroja Poojaam

Nithya Pravrudha Thara Puthra Kalathra Mithra
Sowbhagya Sambad Adhikastha Ihaiva Lokey

Whoever worships Lord Shiva during the Pradosha would avail His blessings. 

The Pradosha Kalam - 'Dosha' Kala is the time to worship Lord Shiva.  The time of 'Pradosha' is 4.30 PM to 7.00PM to worship the glory of Lord Rudra.   The Worship of Lord can be done by Mananam, Sravanam and Keerthanam.  The Mananam is the process of uttering or chanting the glory of Lord Shiva, Sravanam denotes listening or reading   the sacred scriptures and last but not the least singing and praising the glory of the Lord.  'Shiva' in sanskrit means ' The Auspicious'.    

The scriptures describe the worshipping forms of Lord Shiva as:

Anugraha Murthy - Lord Shiva with pleasing features blessing His worshiper

Rudra/Samhara Murthy - Lord Shiva in a fuming rage/ destructive mood

Tandava Murthy - Performing cosmic dance

Sri Dakshina Murthy - Form of an 'Acharya'/ Guru

Linga - Universal form/Nirguna Brahmam

Bhikshadandar - Saintly form

Harihara/Sankaranarayana - Two equal halves represents Hari and   Hara

Ardhanarishwara - Two equal halves, one represent Lord Shiva and other half Goddess Sakthi

Ayur Nasyathi Pasyatham Prathi Dinam
Yathi Kshayam Youvanam
Prathyayanthi Gatha Puna Na Divasa
Kalo Jagat Bakshaka
Lakshmisthoya Thanga Banga Chapala
Vidhyuchalam Jeevitham
Asman Mama Saranagatham Saranadha
Twam Raksha Rakshaa Dhuna

Hara Hara Sankara Jaya Jaya Sankara !!
Jai Sriman Narayana !!